taxonID	type	description	language	source
03B23D4BFFFEFFE09F82E1D3FD47FAA5.taxon	description	Infraorder: Corophiida Lowry & Myers, 2013	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFFEFFE29F82E363FAE8F81F.taxon	description	Figs. 1 A, 3 – 5	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFFEFFE29F82E363FAE8F81F.taxon	diagnosis	Diagnosis Accessory flagellum minute, pereonite 1 of male without sternal spine, coxa 2 posteriorly produced, posterior margin of carpus of male gnathopod 1 having a short spine towards distal end, posterior margin of dactylus of male gnathopod 1 not expanded.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFFEFFE29F82E363FAE8F81F.taxon	etymology	Etymology The species is named in honour of Prof. Geetanjali Dash, Vice-Chancellor of Berhampur University.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFFEFFE29F82E363FAE8F81F.taxon	materials_examined	Type material Holotype India • ♂, 5.5 mm; Rambha, Chilika Lagoon, Odisha; 19 ° 30 ' 51.4 " N, 85 ° 05 ' 50.2 " E; 09 Mar 2024; R. K. Kumar leg., G. Bhoi leg.; ZSI / EBRC / Cr 16878. Paratypes India • 1 ♂, 5.0 mm; same collection data as for holotype; ZSI / EBRC / Cr 16879 • 1 ♂, 5.0 mm; same collection data as for holotype; ZSI / EBRC / Cr 16880 • 1 ♂, 5.0 mm; same collection data as for holotype; ZSI / EBRC / Cr 16881.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	description	Figs. 1 B, 6 & 7	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	etymology	Etymology This species is named after its type locality, the Gulf of Khambhat.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	diagnosis	Diagnosis Male gnathopod 1 basis anterodistal corner produced into a well-developed rounded lobe and propodus posterior margin with two rectangular knobs. Male gnathopod 2 propodus posterior margin convex, smooth and palm oblique. Uropod 3 ramus curved distally.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	materials_examined	Type materials Holotype India • ♂, 6.0 mm; Dandi, Gujarat; 20 ° 53 ' 29 " N, 72 ° 47 ' 36 " E; 13 Mar 2024; D R. Thacker leg.; LFSC. ZRC- 284. Paratypes India • 1 ♂, 6.0 mm (LFSC. ZRC- 285), 5 ♀♀, 5.0 – 6.0 mm; same collection data as for holotype; LFSC. ZRC- 287.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	biology_ecology	Ecology type. Collected from tubes made in hard muddy substratum. Salinity 35 ± 2 PSU.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	description	Description. Based on holotype. HEAD. Eyes small, round. ANTENNA 1 (Fig. 6). Slender, 1.1 x the length of antenna 2; length ratio of peduncular articles 1 – 3 1: 1.23: 0.61; primary flagellum 1.4 × the length of peduncle; accessory flagellum one articulate. ANTENNA 2 (Fig. 6). Stout, length ratio of peduncular articles 3 – 5 1: 2.28: 2.71; flagellum short with 6 articles, article 4 to 6 each with a robust spine. MAXILLA 1 (Fig. 6). Outer plate with eight apical robust setae, palp article 2 with four apical robust setae. MAXILLA 2 (Fig. 6). Inner plate apically setose, an oblique setal row present; outer plate apically setose. MANDIBLE (Fig. 6). Palp 3 articulate, ratio of three articles 1 - 3 1: 2.21: 2.46; incisor with 4 cusps, lacinia mobilis with 3 cusps, 5 accessory setae present. MAXILLIPED (Fig. 6). Inner plate with several plumose setae; outer plate with 5 robust marginal setae and 4 apical thick setae; palp article 2 longest; article 4 with apical nail. GNATHOPOD 1 (Fig. 7). Basis subrectangular 1.5 x longer than broad with four setae on posterior margin, anterodistal corner produced into a rounded lobe; ischium small, subrectangular, broader than long, posterodistal corner with 2 small setae; merus 1.6 x the length of ischium, posterior margin moderately setose; carpus large, 1.6 x longer than broad, anterior margin almost straight with 2 setae, posterior margin with weak undulations, moderately setose, posterodistal corner produced into a long conical tooth, near to that a small rounded knob; propodus anterior margin convex with several setae, posterior margin almost straight, moderately setose with two rectangular knobs; dactylus long reaching almost 0.7 × length of carpus. GNATHOPOD 2 (Fig. 7). Basis 4.5 × longer than broad, anterior margin with eleven small setae, posterior margin with four long setae, posterodistal corner with a pair of long setae; merus 1.6 × as ischium, distal margin sparsely setose; carpus 0.7 × the length of basis, both margins densely setose; propodus subrectangular, both margins moderately setose, palm oblique; dactylus slightly longer than palm. PEREOPOD 3 (Fig. 7). Basis 1.8 × the length of merus, anterior margin with 7 sized setae, posterior margin with six setae; ischium small, subrectangular, posterodistal corner with 3 setae; merus 1.6 × the length of propodus, anterior margin with five setae, posterior margin with three setae, anterodistal and posterodistal corner with four and three setae respectively; carpus 0.8 × the length of propodus, anterior margin with two setae, posterior margin with nine setae, anterodistal corner with one seta; propodus slender, with four setae on anterior margin, six setae on posterior margin, anterodistal corner with a pair of setae; dactylus slender, 0.5 × the length of propodus. PEREOPOD 4 (Fig. 7). Basis 1.5 × the length of merus, anterior margin with 8 sized setae, posterior margin with four setae, posterodistal corner with two setae; ischium small, subrectangular, posterodistal corner with 3 setae; merus 1.2 × the length of propodus, both margins with four setae on each, anterodistal and posterodistal corner with a pair of setae on each; carpus 0.7 × the length of propodus, anterior margin with two setae, posterior margin with three setae, anterodistal corner with three setae, posterodistal corner with a pair of setae; propodus slender, with three setae on anterior margin, five setae on posterior margin, anterodistal corner with a tuft of 4 – 5 setae; dactylus slender, 0.5 × the length of propodus. PEREOPOD 5 (Fig. 7). Shorter than pereopod 4; basis anterior margin with two small setae, posterior margin with ten setae, anterodistal margin with 2 simple and one robust setae; ischium small with a single seta on anterior margin; merus subequal to propodus with 6 – 7 setae on anterior margin, two setae on posterior margin, anterodistal corner with a tuft of three setae, posterodistal corner with one seta; carpus 0.7 × the length of propodus, three small to medium sized spines on posterior margin, anterodistal corner with two long setae, posterodistal corner with a single seta; propodus anterior margin with five setae, posterior margin with four small to medium sized spines, anterodistal corner with a tuft of setae, posterodistal corner with two thin setae and a single spine; dactylus short, 0.5 × the length of propodus. PEREOPOD 6 (Fig. 7). 0.8 x the length of pereopod 7; basis subrectangular, anterior margin with seven small setae, posterior margin with two robust setae and sparsely placed setae; ischium longer than broad, anteroventral corner with one thin and one robust seta; merus 1.4 × the length of carpus, anterior margin with few thin setae, posterior margin with two thin and five thick setae, anterodistal corner with a pair of setae, posterodistal corner with one robust seta and two long thick setae; carpus 0.6 × the length of propodus, anterior margin with three setae, posterior margin with four setae, medial surface with four spines, anterodistal corner with three setae, posterodistal corner with two long setae and one spine; propodus subequal to basis, anterior margin with four simple setae and four robust setae, posterior margin with seven setae, posterodistal corner with a tuft of long setae; dactylus 0.4 × the length of propodus. PEREOPOD 7 (Fig. 7). Basis anterior margin with five small setae, posterior margin sparsely six small robust setae and densely placed long plumose setae; ischium small, with a tuft of three setae on anterodistal corner; merus 2 × the length of carpus, anterior margin with seven setae, posterior margin with five setae, posterodistal corner with two long setae; carpus 0.6 × the length of propodus, anterior margin with four setae, posterior margin with five setae, anterodistal and posterodistal corners with two setae each; propodus subequal to basis, anterior margin with 8 – 10 small setae, posterior margin with 9 – 10 long setae, anterodistal corner with two long setae, posterodistal corner with a tuft of long setae; dactylus 0.5 × the length of propodus. EPIMERA 1 – 3 (Fig. 6). Ventral margin bare, posteroventral corner of each with a thick seta. UROPOD 1 (Fig. 6). Peduncle 1.8 × longer than both subequal rami; inter ramus spine very small. UROPOD 2 (Fig. 6). Peduncle subequal to endopodite; exopodite 0.7 × the length of endopodite. UROPOD 3 (Fig. 6). Uniramous; ramus curved distally, 1.8 × the length of peduncle. TELSON (Fig. 6). 0.8 × the length of broad, laterodistal corner each with one long and one short seta. Female (sexually dimorphic characters). GNATHOPOD 1 (Fig. 7). Basis subrectangular 2 × longer than broad, posteroventral corner with a tuft of setae; ischium subrectangular; merus 2 × the length of ischium; carpus subtriangular, 0.6 × the length of propodus, anterior margin with few setae, posterior margin moderately setose; propodus oval, both margins sparsely setose, palm with 2 robust setae on the posterior corner and 2 robust setae behind the palm; dactylus subequal to palm. GNATHOPOD 2 (Fig. 7). Basis 3.8 × longer than broad, anterior margin with several small setae, posterior margin with 3 setae, posterodistal corner with a tuft of 2 setae; ischium small; carpus 2.6 × longer than broad, anterior margin sparsely setose, posterior margin densely setose; propodus oval, 0.9 × the length of carpus, both margins sparsely setose, palm with 2 small robust setae on the posterodistal corner and 2 small seta behind palm; dactylus subequal to palm.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	discussion	Remarks Grandidierella khambhatensis sp. nov. described here appears to be very close to G. perlata Schellenberg, 1938 in having the following character states: male gnathopod 1 carpus anterior margin almost straight, posterior margin with undulations; propodus anterior margin convex, posterior margin almost straight with two knobs. However, G. khambhatensis sp. nov. can be differentiated from G. perlata in having following characters: male gnathopod 1 basis anterodistal corner produced into a well-developed rounded lobe (Fig. 7 G 1) (versus posteroventral lobe not well-developed in G. perlata, Schellenberg (1938); Fig. 46 a); male gnathopod 1 carpus posterior margin with weak undulations, posterodistal corner tooth with blunt end and no stridulating organs (Fig. 7 G 1) (versus posterior margin with strong undulations, posterodistal corner tooth with sharp end and presence of stridulating organs in G. perlata, Schellenberg (1938); Fig. 46 a); male gnathopod 1 propodus posterior margin with two rectangular knobs (Fig. 7 G 1) (versus knobs more rounded in shape in G. perlata, Schellenberg (1938); Fig. 46 a); male gnathopod 2 propodus posterior margin convex with smooth ridges and palm oblique (Fig. 7 G 2) (versus propodus posterior margin straight with crenated ridges and palm straight in G. perlata, Schellenberg (1938); Fig. 46 b); uropod 3 ramus hook shaped (Fig. 6 U 3) (versus ramus rod shaped-straight).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF7FFEC9F82E0D6FC5EFF66.taxon	distribution	Distribution Currently known only from its type locality, Dandi, Gujarat State, India.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	description	Figs. 1 C, 8 – 10	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	diagnosis	Diagnosis Male pereonite 1 with a small sternal spine, gnathopod 1 carpus proximal end V shaped and gnathopod 1 dactylus broad near the base and gradually decreasing toward the distal end.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	materials_examined	Material examined India • 3 ♂, 4.0 – 5.0 mm, 1 ♀, 4.0 mm; Sutrapada, Gujarat; 20 ° 50 ' 27 " N, 70 ° 27 ' 55 " E; 8 Jan 2024; D. R. Thacker leg.; LFSC. ZRC- 286.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	biology_ecology	Ecology type. Collected from muddy substratum. Salinity 35 ± 2 PSU.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	description	Description. Based on male 4.5 mm. HEAD. Eyes small, round, well-developed. ANTENNA 1 (Fig. 8). Peduncular articles slender, about 1.4 × the length of antenna 2; length ratio of peduncular articles 1 – 3 1: 1.14: 0.41; primary flagellum 1.3 × the length of peduncle; accessory flagellum absent. ANTENNA 2 (Fig. 8). Stout, length ratio of peduncular articles 3 – 5 1: 2.49: 2.49; flagellum short with 4 articles, article 2 to 4 each with a robust spine. MAXILLA 1 (Fig. 8). Outer plate with several apical robust setae, palp article 2 with 5 apical robust setae. MAXILLA 2 (Fig. 8). Inner plate apically setose, a long oblique row of setae present; outer plate apically setose. MAXILLIPED (Fig. 8). Inner plate with several plumose setae; outer plate with four apical robust setae and five robust marginal setae; palp article 2 longest; article 4 with apical nail. PEREONITE 1. With very small sternal spine visible only after removal of gnathopod 1. GNATHOPOD 1 (Fig. 9). Basis subrectangular twice as long as broad with few setae on posterior margin; ischium small, subrectangular; carpus large, elongate, 2.9 × the length of propodus, 1.7 × longer than broad, posterodistal corner produced into a medium sized triangular tooth, a small robust seta on posterior margin and a small conical tooth on distal margin; propodus subrectangular, anterior margin convex; dactylus length subequal to propodus, inner margin smooth with few small hairs, proximally expanded. GNATHOPOD 2 (Fig. 9). Basis 3.5 × longer than broad, anterior margin sparsely setose with small setae; ischium small subquadrate; merus 2 × as long as broad; carpus 2.5 × longer than broad, anterior margin sparsely setose, posterior margin densely setose; propodus subrectangular, 2.1 × longer than broad, anterior margin sparsely setose, posterior margin densely setose; dactylus subequal to palm, inner margin serrated. PEREOPOD 3 – 4 (Fig. 9). Both similar; basis around 1.7 × the length of merus; ischium small, subrectangular; merus subequal to propodus, both margins with few setae on each side; carpus with one or two small setae on anterior margin, few simple setae on posterior margin; propodus slender, 1.3 × the length of dactylus, with a single seta on anterior margin; two to four setae on posterior margin, anterodistal corner with a tuft of few small simple setae; dactylus slender. PEREOPOD 5 (Fig. 9). Shorter than pereopod 4; basis anterior margin with very few small setae, posterior margin with one to two small setae; ischium small with a single seta at anterodistal corner; merus subequal to propodus with one seta on anterior margin, anterodistal corner with two setae; carpus with one single seta on anterior margin, posterior margin with three small to medium sized spines, anterodistal corner with one long thick and one small setae; propodus anterior margin with two small setae, posterior margin with four small to medium sized spines, anterodistal corner with two thin setae; dactylus short, 0.6 x the length of propodus. PEREOPOD 6 (Fig. 9). 0.8 × the length of pereopod 7; basis subrectangular, anterior margin with five small robust setae, posterior margin with five robust setae and sparsely placed setae; ischium longer than broad with one small seta on anterior margin; merus 3.7 × longer than broad, anterior margin with few small setae, posterior margin with one small thin and two long thick setae, anterodistal corner with one robust seta, posterodistal corner with one thin long and one small robust setae; carpus 0.6 × the length of merus, anterior margin with one seta, posterior margin bare; both distal corners with a thick seta; propodus 0.8 × the length of basis, posterior margin with three setae, anterior margin with three spines; dactylus 0.5 × the length of propodus. PEREOPOD 7 (Fig. 9). Basis anterior margin with four small robust setae, posterior margin sparsely four to five small robust setae and densely placed long plumose setae; ischium small with two setae on anterodistal corner; merus 0.9 × the length of basis, anterior margin with a single seta, posterior margin with several setae, anterodistal corner with one simple and one robust setae, posterodistal corner with one long robust seta; carpus 0.8 × the length of merus; propodus subequal to basis, posterior margin with few small setae, anterior margin with five robust setae; posterodistal corner with a tuft of long setae; dactylus 0.4 × the length of the propodus. EPIMERA. 1 & 3 (Fig. 8). Ventral margin bare and anterior and posterior corners rounded. EPIMERA 2 (Fig. 8). Posteroventral corner with a single seta. UROPOD 1 (Fig. 9). Peduncle 1.5 × longer than both subequal rami; inter ramus spine 0.3 × the length of rami. UROPOD 2 (Fig. 9). Peduncle 0.9 × the length of exopodite; exopodite 0.76 × the length of endopodite. UROPOD 3 (Fig. 9). Uniramous; ramus almost 1.7 × the length of peduncle. TELSON (Fig. 8). 1.6 × as broad as long, laterodistal corner each with one long and one short setae. Female (sexually dimorphic characters). GNATHOPOD 1 (Fig. 10). Basis subrectangular, 2.5 × longer than wide; carpus 0.88 × as long as basis, anterior margin with one seta, posterior margin densely setose; propodus 0.8 × as long as carpus, anterior margin with three setae, posterior margin densely setose and three robust setae present in a row behind palm, palm very short; dactylus inner margin with three to four small spines. GNATHOPOD 2 (Fig. 10). Basis 2.8 × longer than broad, anterior margin with 8 small setae; carpus subequal to propodus, anterior margin with three setae, posterior margin densely setose, anterodistal corner with two setae; propodus subrectangular, both margins weakly setose, palm very small; dactylus subequal in length to palm, inner margin with three to four small spines.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	discussion	Remarks Stephensen (1933) first recorded a species as G. megnae on the basis of materials collected from the Islands of Bonaire, West Indies. Later on, he revised his diagnosis and referred this material along with further material collected from Bonaire and Curaçao, salt water as a new species, G. bonnieroides. Stephensen (1947) differentiated G. bonnieroides from G. bonnieri Stebbing, 1908 by characters, such as — gnathopod 1 carpus parallel sided (oval in G. bonnieri) and three spinal processes on gnathopod 1 carpus (only one spinal process in G. bonnieri). Stephensen (1947) also differentiated G. bonnieroides from G. bonnieri reported by Barnard (1935) from Kerala, India, by the following characters — absence of spine on pereonite 1 and 2. After comparing his materials with both reports of G. bonnieri, Stephensen (1947) concluded that his materials from Bonaire and Curaçao are close to G. bonnieri Stebbing, 1908, but definitely not the same species and described his material as a new species — G. bonnieroides, and also suspected that his materials are not close with the specimens of G. bonnieri reported by Barnard (1935). Later, Myers (1970) examined materials of G. bonnieroides from several locations from the Caribbean and Gulf of Mexico and observed a considerable variation in the relative development of the sternal spine of pereonite 1 and 2. He observed that the spine was usually present on pereonite 1 and sometimes well-developed, whereas the spine on pereonite 2 was usually absent but sometimes well-developed. He also observed similar kinds of variations in antenna 2, where sometimes it was robust and sometimes slender, and also with intermediate forms. Keeping these variations in consideration, Myers (1970) concluded that all the specimens are conspecific and considered them as a single species, G. bonnieroides. Thus, he synonymized G. bonnieri, reported by Barnard (1935) with G. bonnieroides. The specimens examined here have a pereonite 1 spine that is relatively well developed and the pereonite 2 is lacking the spine. Moreover, it has three spinal processes on gnathopod 1 carpus, which makes the specimens examined here identical to G. bonnieroides reported by Asari & Myers (1982) collected from the Vellar-Coleroon estuarine complex, Porto Novo, Tamil Nadu, India.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFF2FFF09F82E42BFD67F8E5.taxon	distribution	Distribution Chilika Lake, Odisha, India (Chilton 1921); Suez canal (Schellenberg 1928); Etang Saumâtre, Haiti (Shoemaker 1935); Njarackal, Cochin, Kerala, India (K. H. Barnard 1935); Adyar, Chennai, Tamil Nadu, India (Panikkar & Aiyar 1937); Brazilian coast (Schellenberg 1938); Curaçao; Bonaire (Shoemaker 1948; Stephensen 1933; 1948; Lowry & Stoddart, 2003); Durban Bay, Durban, South Africa; Richards Bay, Kwa Zulu-Natal, South Africa (K. H. Barnard 1951; 1952); Soalara, Madagascar (Ruffo 1958); Madras, Tamil Nadu, India (Nayar 1959); Tuticorin, Tamil Nadu, India; Mandapam, Tamil Nadu, India (Nayar 1966); Tulear, Madagascar (Ledoyer 1967; 1968; 1973); Gran Roque, Los Roques Islands, Venezuela; Marguerita Island, Venezuela; Tortola Island, British West Indies, Caroni Swamp, Trinidad; Port St. Joe, Florida; Salt Spring, Marion, Florida; Williams, Lake Pontchartrain, Louisiana; Riviera Beach, Baffin Bay, Texas; Sta. Marta Island, Colombia; Msasani Bay, Tanzania (Myers 1970); Madagascar (Mayers, 1972); Mozambique (Griffiths 1973); Natal, Brazil (Griffiths 1974 a); Cape Province east of Cape Agulhas (Griffiths 1974 b); Lizard Island, Queensland, Australia (Myers 1981); Lagoons Dawhat as Sayh, Arabian Gulf, Saudi Arabia (Myers 1981); Vellar-Coleroon estuarine, Porto Novo, Tamil Nadu, India (Asari & Myers 1982); Gulf of Aqaba, Red Sea (Lyons & Myers 1990); Bonaire, Netherlands Antilles, Caribbean Sea (Myers 2009); Israel coast, Mediterranean Sea (Lo Brutto et al. 2016) and Sutrapada, Gujarat, India (Present study). In the present study this species is first time reported from Gujarat State, India.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	description	Figs. 2 A, 11 & 12	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	diagnosis	Diagnosis Male gnathopod 1 basis large with both margins convex, carpus large with one long conical tooth extending from the inner margin and posterodistal corner produced into a small conical tooth. Epimera 1 – 3 posteroventral corners with a thick seta and a single thin seta on distodorsal margin on each.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	materials_examined	Material examined India • 2 ♂, 6.0 mm; Tithal, Gujarat; 20 ° 35 ' 26 " N, 72 ° 48 ' 45 " E; 12 Mar 2024; D. R. Thacker leg.; LFSC. ZRC- 287.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	biology_ecology	Ecology type. Collected from muddy substrate. Salinity 35 ± 2 PSU.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	description	Description. Based on male 6 mm. ANTENNA 1 (Fig. 11). Slender, subequal to antenna 2; length ratio of peduncular articles 1 – 3 1: 1.18: 0.52; primary flagellum 1.2 × length of peduncle; accessory flagellum one articulate. ANTENNA 2 (Fig. 11). Stout, length ratio of peduncular articles 3 – 5 1: 2.14: 2; flagellum short with 7 articles, article 3 to 7 each with a robust spine. MAXILLA 1 (Fig. 11). Outer plate with 10 apical robust setae; palp article 2 with 5 apical robust setae and 4 – 5 simple setae. MAXILLA 2 (Fig. 11). Inner plate apically setose, oblique setal row present; outer plate apically setose. MANDIBLE (Fig. 11). Palp 3 articulate, ratio of three articles 1 – 3 1: 1.47: 1.03; incisor with 5 cusps, lacinia mobilis with 3 cusps, 6 accessory setae present. MAXILLIPED (Fig. 11). Inner plate with several plumose setae; outer plate with four apical thick setae and 6 marginal robust setae; palp article 2 longest; article 4 with apical nail. GNATHOPOD 1 (Fig. 12). Coxa trapezoidal; basis very broad with both margins convex, 1.3 × longer than broad, posterior margin with a single simple seta; ischium small; merus twice the length of ischium; carpus large, elongate, 1.6 × as the length of basis, 1.8 × longer than broad with a very long conical tooth extending from the inner margin, posterodistal corner produced into a small conical tooth, anterior margin with a few small setae, posterior margin several medium sized setae; propodus with both margins curved; dactylus subequal to propodus, both margins smooth. GNATHOPOD 2 (Fig. 12). Coxa longer than broad; basis 3.8 × longer than broad, both margins bare; ischium small subquadrate; merus 1.8 × the length of ischium; carpus 2.85 × longer than broad, anterodistal corner with a pair of long setae; propodus suboval, 2 × longer than broad, anterior margin sparsely setose, posterior margin with one or two small setae; dactylus subequal in length to palm, distal part of inner margin serrated. PEREOPOD 3 – 4 (Fig. 12). Similar; basis 3.2 × longer than broad, anterior margins with 8 – 10 small setae, posterior margin with 6 – 7 medium sized setae; ischium small, subrectangular, posterodistal corner with a single seta; merus around 1.4 × the length of propodus; carpus with one or two small setae on anterior margin, 6 – 7 simple setae on posterior margin; propodus slender, 1.5 × the length of dactylus, with several setae on anterior margin, two setae on posterior margin, anterodistal corner with a tuft of few simple setae, posterodistal corner with a single seta; dactylus slender. PEREOPOD 5 (Fig. 12). Basis subrectangular anterior margin with six small setae, posterior margin with few small and medium sized setae; ischium small with a pair of setae on anterodistal corner; merus subequal to propodus, with four setae on anterior margin, and a tuft of three setae on anterodistal corner; carpus with two setae on anterior margin, a tuft of two setae on anterodistal corner, posterior margin with two robust setae; propodus 1.3 × the length of carpus, anterior margin with three setae, anterodistal corner with a tuft of three simple setae, posterior margin with four robust setae; dactylus small, 0.4 × the length of propodus. PEREOPOD 6 (Fig. 12). 0.9 × the length of pereopod 7; basis subrectangular, anterior margin with eight small setae, posterior margin with five robust setae and sparsely placed plumose setae, anterodistal corner with a tuft of three setae; ischium longer than broad with a pair of setae on anterodistal corner; merus 5 × longer than broad, anterior margin with few small setae, posterior margin with two small thin and three long thick setae, anterodistal corner with two thick setae, posterodistal corner with one thick long setae; carpus 0.8 × the length of merus, anterior margin with two small setae, posterior margin with one small; both distal corners with two thin setae; propodus 0.9 × the length of basis, anterior margin with five spines, posterior margin with one small seta, posterodistal corner with two thick long setae; dactylus 0.5 × the length of propodus. PEREOPOD 7 (Fig. 12). Basis anterior margin with six small robust setae, posterior margin with eight small robust setae and densely placed long plumose setae; ischium small, subrectangular, with two setae on anterodistal corner; merus 0.9 × the length of basis, anterior margin with four small setae, posterior margin with three thick setae, anterodistal and posterior corner with two setae on each; carpus 0.7 × the length of merus, anterior margin with two setae, posterior margin with three setae, anterodistal corner with one thick seta, posterodistal corner with one thin and two thick setae; propodus subequal to basis, anterior margin with five small spines and three small setae; posterodistal corner with a tuft of long setae; dactylus 0.3 × the length of propodus. EPIMERA 1 – 3 (Fig. 11). Posteroventral corner and distodorsal margin of epimera 1 – 3 each with a single simple seta. UROPOD 1 (Fig. 11). Peduncle 1.2 × longer than endopodite; endopodite 1.1 × longer than exopodite; inter ramus spine 0.3 × longer than exopodite. UROPOD 2 (Fig. 11). Peduncle 0.5 × longer than endopodite; exopodite 0.7 × longer than endopodite. UROPOD 3 (Fig. 11). Uniramous; ramus almost 2.9 × the length of peduncle. TELSON (Fig. 11). 1.4 × as broad as long, laterodistal corner each with one long robust seta.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	discussion	Remarks Chilton (1921) recorded G. megnae on the basis of specimens collected from Chilika Lake, Odisha State, India and also provided three illustrations (Fig. 10 m, n, o) of male gnathopod 1 to show the variation in morphology among the specimens of G. megnae. Later on, Barnard (1935) re-checked these three illustrations of male gnathopod 1 of G. megnae specimens given by Chilton (1921) and confirmed that they belong to a new species, G. macronyx. The specimen observed here matches with the description and illustrations of G. macronyx given by Asari & Myers (1982). However, there are few variations in the morphology of some body parts as follow: the specimen dissected here does not have the triangular tooth on the inner margin of propodus of male gnathopod 1 (Fig. 12 Gn 1) (versus a triangular tooth present in G. macronyx, Asari & Myers (1982); Fig. 1 K); the male gnathopod 1 dactylus is short, reaching only 0.49 x length of carpus (Fig. 12 Gn 1) (versus dactylus very long reaching almost 0.7 × of the carpus length in G. macronyx, Asari & Myers (1982); Fig. 1 J, K); telson subrectangular and laterodistal corner each with one long robust seta (Fig. 11 T) (versus telson rounded and laterodistal corner each with one robust and one simple seta in G. macronyx, Asari & Myers (1982); Fig. 1 F).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEDFFF49F82E58BFEA3F975.taxon	distribution	Distribution Chilika lake, Odisha, India (Chilton, 1921; Barnard, 1935), Vellar Estuary, Tamil Nadu, India (Asari & Myers, 1982) and Tithal, Gujarat (present study), India. In the present study this species is first time reported from the West Coast of India.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	description	Figs. 2 B, 13 & 14	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	diagnosis	Diagnosis Male gnathopod 1 carpus large with posterodistal corner produced into a large conical tooth and inner surface with a small accessory tooth. Dactylus inner margin smooth with few small hairs, proximally expanded.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	materials_examined	Material examined India • 3 ♂, 4.0 – 5.0 mm; Tithal, Gujarat; 20 ° 35 ' 26 " N, 72 ° 48 ' 45 " E; 12 Mar 2024; D. R. Thacker leg.; LFSC. ZRC- 288.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	biology_ecology	Ecology type. Collected from Muddy substrate. Salinity 35 ± 2 PSU.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	description	Description. Based on male 5 mm. ANTENNA 1 (Fig. 13). Slender, about 1.3 × the length of antenna 2; length ratio of peduncular articles 1 – 3 1: 1.28: 0.56; primary flagellum subequal to peduncle; accessory flagellum minute. ANTENNA 2 (Fig. 13). Stout, length ratio of peduncular articles 3 – 5 1: 2.45: 2.49; flagellum short with 7 articles, article 3 to 7 each with a robust spine. MAXILLA 1 (Fig. 13). Outer plate with several apical robust setae, palp article 2 with 6 apical robust setae. MAXILLA 2 (Fig. 13). Inner plate with several apical and 3 marginal setae and a sparse row of setae, outer plate apically setose. MAXILLIPED (Fig. 13). Inner plate with several plumose setae; outer plate with 4 apical thick setae and 5 robust marginal setae; palp article 2 longest, inner margin densely setose; article four with apical nail. GNATHOPOD 1 (Fig. 14). Coxa subrectangular, longer than broad, anteroventral corner produced; basis 1.7 × longer than broad with a single seta on anterior margin; ischium broader than long, subrectangular; carpus large, elongate, 1.8 × longer than broad with a long conical tooth at posterodistal corner; propodus both margins convex; dactylus inner margin smooth with few small hairs, proximally expanded. GNATHOPOD 2 (Fig. 14). Coxa subrectangular, longer than broad; basis 3.4 × the length as broad, posterior margin sparsely setose; ischium subquadrate; carpus 2.6 × longer than broad, both margins setose; propodus somewhat oval, 0.7 × the length of carpus, palm with several setae; dactylus subequal in length to palm, distal half of the inner margin serrated. PEREOPOD 3 – 4 (Fig. 14). Similar; basis around 3.3 × longer than broad; ischium small, subrectangular; merus subequal to propodus, both margins with 2 – 3 setae on each side, 2 long setae on both distal corners; carpus with a single small seta on anterior margin and several long setae on posterior margin; propodus slender, with few setae on both margins and a tuft of setae on anterodistal corner; dactylus subequal to carpus, slender. PEREOPOD 5 (Fig. 14). Shorter than pereopod 4; basis anterior margin with very few small setae, posterior margin with sparsely placed short and long setae; ischium small; merus subequal to carpus with thick setae on anterior margin, posterior margin with a small seta, posterodistal corner with a long thick seta; carpus anterior margin with three small to long setae, posterior margin with three spines; dactylus short, less than one third of the propodus. PEREOPOD 6 (Fig. 14). 0.9 × the length of pereopod 7; basis subrectangular, anterior margin with 7 small robust setae, posterior margin with few robust setae and sparsely placed plumose setae; ischium longer than broad with one long, thick seta at anterior margin; merus 5.7 × longer than broad, anterior margin with one seta, posterior margin with four setae, anterodistal corner with two short setae, posterodistal corner with one long setae; carpus 0.9 × the length of merus, anterior margin with 2 and posterior margin with 3 short setae, both distal corners with a tuft of two thick setae; propodus subequal to basis, anterior margin with 4 robust setae; dactylus nearly one third of the propodus. PEREOPOD 7 (Fig. 14). Basis anterior margin with 6 small robust setae, posterior margin sparsely 7 – 8 small robust setae and spaced apart plumose setae; ischium small with one seta at anterior margin and one seta at anterodistal corner; merus subequal to basis, both margins with several setae, anterodistal corner with one simple and one robust setae, posterodistal corner with one long simple seta; carpus 0.8 × the length of merus; propodus subequal to basis; anterior margin with four small setae, posterior margin with two robust setae, posterodistal corner with a tuft of long setae; dactylus one third of the propodus. EPIMERA 1 – 3 (Fig. 13). Ventral margin bare and anterior and posterior corners rounded. UROPOD 1 (Fig. 14). Peduncle 1.2 × longer than both subequal rami; inter ramus spine 0.2 × the length of exopod. UROPOD 2 (Fig. 14). Peduncle subequal to endopodite; exopodite 0.7 × the length of endopodite. UROPOD 3 (Fig. 14). Uniramous; ramus almost 2.9 × the length of peduncle. TELSON (Fig. 13). Longer than broad, ventral margin with a small inward curve, laterodistal corner each with one long seta.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	discussion	Remarks Giles (1890) described Microdeutopus megnae based on specimens collected from Meghna Shoals, Bangladesh. Later, this species was transferred to the genus Grandidierella by Stebbing (1908) based on specimens collected from Port Canning, West Bengal, India, under the name Grandidierella bonnieri, later synonymized with G. megnae. The specimen dissected here agrees with the description and illustrations of G. megnae (Giles, 1890).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFEAFFF89F82E22EFD85FC31.taxon	distribution	Distribution Megna shoals, Bangladesh (Giles, 1890); Port Canning, West Bengal, India (Stebbing, 1908); Mozambique, South Africa (Barnard, 1955) and Tithal, Gujarat, India (Present study). In the present study this species is first time reported from Gujarat State, India.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE6FFF89F82E6EAFE81FAE7.taxon	diagnosis	Diagnosis. No sternal spines on pereonite 1 and 2. Male gnathopod 1 carpus large, with posterodistal corner produced into a medium sized spine, one small conical spine on the distal margin and two spines on the inner surface.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE6FFF89F82E6EAFE81FAE7.taxon	discussion	Remarks. This species was described by Schellenberg (1938) on the basis of specimens collected from the Bismarck archipelago. This species can be differentiated from its congeners by having two spines on the posterior margin of the male gnathopod 1 carpus.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE6FFF89F82E6EAFE81FAE7.taxon	distribution	Distribution. Bismarck archipelago (Schellenberg 1938) and Vellar estuary, Tamil Nadu, India (Thilagavathi et al. 2013).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE6FFFB9F82E0D9FF7EFE1D.taxon	diagnosis	Diagnosis. Male gnathopod 1 ischium and merus lacking posterodistal projection; merus to propodus heavily setose posteromedially; carpus with 2 posterodistal teeth; propodus straight. Male gnathopod 2, coxa without posteromedial projection; basis straight; merus divergent posteriorly, posterodistal margin with many long setae; carpus and propodus same in size, elongate, heavily setose posteromedially, propodus posterodistal corner with 2 short robust setae; dactylus very short. Uropod 1 with an inter-ramal process.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE6FFFB9F82E0D9FF7EFE1D.taxon	discussion	Remarks. Chilton (1921) first described this species on the basis of the specimens collected from Chilika Lake, Odisha, India. After that it was reported several times from various localities. However, it was not described or illustrated sufficiently until Ansari and Myers (1982) gave the detailed description and illustrations on the basis of specimens collected from Killai backwaters, Tamil Nadu, India.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE6FFFB9F82E0D9FF7EFE1D.taxon	distribution	Distribution. India (Chilton 1921); Talé Sap, Thailand (Chilton 1925), Lapinig, Philippines (Schellenberg 1938); Bay of Nhatrang (Imbach 1967); Java, Indonesia (Ledoyer 1979); Australia (Myers 1981); Maros (Ortiz & Lalana 1999); Phuket (Myers 2002); Hainan Island, China (Ren 2006); Bangkok (Wongkamhaeng et al. 2016) and Iriomote Island, Okinawa Prefecture, Japan (Ariyama 2020). In India, the species is reported from Odisha (Chilton 1921); Visakhapatnam, Andhra Pradesh (Barnard 1935); Tamil Nadu (Panikkar & Aiyar 1937; Nayar 1959; Lyla et al. 1998; Asari & Myers 1982; Lyla et al. 2004; Venkataraman 2007; Mondal et al. 2010; Thilagavathi et al. 2013).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE5FFFB9F82E4C6FB8AFB8B.taxon	diagnosis	Diagnosis. Male pereon without ventral processes. Male gnathopod 1 carpus and propodus subequal, posterior margin with single tooth and hook shape uropod 3 rami.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE5FFFB9F82E4C6FB8AFB8B.taxon	discussion	Remarks. Barnard (1935) described this species on the basis of specimens collected from Vembanad Lake and Mundattalkari, Kerala, India. Barnard (1935) synonymized G. megnae reported by Chilton (1925) from Thailand with the G. gravipes. Barnard (1935) also added G. megnae reported by Schellenberg (1925) from Cameroon, in the synonym list of G. gravipes. However, Barnard (1935) stated that while the Cameroon specimen examined by Schellenberg (1925) represents a new species, it remains uncertain whether it is truly conspecific with G. magnae.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE5FFFB9F82E4C6FB8AFB8B.taxon	distribution	Distribution. Cameroon (Schellenberg 1925); Tale Sap, Siam, Thailand (Chilton 1925); India (Barnard 1935). In India, the species is reported from Kerala (Barnard 1935; Surya Rao 1972; Dev Roy et al. 2009) and Tamil Nadu (Asari & Myers 1982; Lyla et al. 1998; Thilagavathi et al. 2013; Azhagu 2017).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE5FFFB9F82E16DFB9CF807.taxon	diagnosis	Diagnosis. Antenna 1 slightly longer than antenna 2 and with uniarticulate accessory flagellum. Ventral margin of coxa of male gnathopod 2 posteriorly produced into a triangular expansion. Male gnathopod 1 carpochelate and larger than gnathopod 2, carpus with tooth on the distal margin, posterodistal corner and a smaller tooth on the posterior margin.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE5FFFB9F82E16DFB9CF807.taxon	discussion	Remarks. This species has been reported from Thailand, India and Japan (Wongkamhaeng et al. 2012; Ariyama 2020; Kumar et al. 2024). Ariyama (2020) recorded this species from Okinawa Island and Iriomote Island, Japan and corrected its name from G. halophilus to G. halophila because the gender of the genus is feminine. Recently Kumar et al. (2024) recorded this species from India as Grandidierella halophilus and commented that G. halophila (Ariyama 1920) seemed to be a different species from G. halophilus (Wongkamhaeng et al. 2012). Kumar et al. (2024) described the following differences between these two materials: in G. halophilus the male gnathopod coxa 2 is produced into a prominent triangular expansion (versus a not so prominent triangular expansion in G. halophila); the male gnathopod 1 carpus is elongate (versus carpus more oval in G. halophila); antenna 1 flagellum is 24 - articulate (versus flagellum 14 - articulate in G. halophila). It is possible that all these differences could be due to the variation in the size of the examined specimens. The specimen examined by Wongkamhaeng et al. (2012) is much larger (6.9 mm) than the one examined by Ariyama (2020) (4 mm).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE5FFFB9F82E16DFB9CF807.taxon	distribution	Distribution. Inner Gulf of Thailand, Samut Sakorn (Wongkamhaeng et al. 2012); Okinawa Island and Iriomote Island, Japan (Ariyama 2020) and Haripur, Odisha, India (Kumar et al. 2024).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE4FFFA9F82E1DFFE9AF91D.taxon	diagnosis	Diagnosis. Male gnathopod 1 carpus elongate, posterodistal corner produced into a small triangular spine, a small triangular tooth on the distal margin and a small spine on the inner face of the posterior margin. Female gnathopod 1 basis slender and 4 × longer than broad.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE4FFFA9F82E1DFFE9AF91D.taxon	discussion	Remarks. Myers et al. (2019) described this species on the basis of specimens collected from the Palakayatippa, Tamil Nadu, India. This species belongs to the Grandidierella mahafalensis Coutière, 1904, species-complex. This species was differentiated from its close congener G. mahafalensis by having male gnathopod 1 carpus posterodistal spine comparatively shorter and comparatively longer female gnathopod 1 basis length and width ratio.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE4FFFA9F82E1DFFE9AF91D.taxon	distribution	Distribution. This species is reported only from its type locality Palakayatippa, Tamil Nadu, India (Myers et al. 2019).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE4FFFD9F82E3C6FE07FED5.taxon	diagnosis	Diagnosis. Sternal spine on male pereonite 1 long and backwardly directed. Male Gnathopod 1 carpus anterior margin with few setae, posterodistal spine present; propodus oval with anterior and posterior margin convex. Male gnathopod 2 coxa ventral margin without spine; basis 3.4 × longer than broad.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE4FFFD9F82E3C6FE07FED5.taxon	discussion	Remarks. This species was described on the basis of the specimens collected from the Barkuda Island, Chilika Lake, Odisha, India. This species can be differentiated from its closely related congeners G. mahafalensis and G. nioensis by having male gnathopod 2 carpus oval shaped with anterior and posterior margins convex and comparatively smaller male gnathopod 2 basis length and width ratio.	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
03B23D4BFFE4FFFD9F82E3C6FE07FED5.taxon	distribution	Distribution. This species is only reported from its type locality Barkuda Island, Chilika Lake, Odisha, India (Thacker et al. 2024 b).	en	Thacker, Dimple R., Patro, Shesdev, Bhoi, Gitanjali, Myers, Alan A., Kumar, R. Kiran, Trivedi, Jigneshkumar N. (2025): On the genus Grandidierella Coutière, 1904 (Amphipoda: Aoridae) of India with the description of two new species. Zootaxa 5716 (4): 451-482, DOI: 10.11646/zootaxa.5716.4.1, URL: https://doi.org/10.11646/zootaxa.5716.4.1
