Caridina gracilirostris De Man, 1892: 399 Caridina gracilirostris Bouvier 1925: 142 de Mazancourt et al. 2019a: 166 Solomon’s Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species Mazancourt, Valentin de Boseto, David Marquet, Gerard Keith, Philippe European Journal of Taxonomy 2020 2020-08-04 696 1 86 8V755 De Man, 1892 De Man 1892 [571,1017,444,471] Malacostraca Atyidae Caridina Animalia Decapoda 11 12 Arthropoda species gracilirostris   Figs 2E, 4, 25A      Caridina gracilirostris De Man, 1892: 399, pl. 25: fig. 31a–d ( typelocality: several localities, Sulawesi( Celebes) Indonesia).    Caridina gracilirostris–  Bouvier 1925: 142, figs 305–307. — Blanco 1935: 32, pl. 2, figs 11–17. —  de Mazancourt et al.2019a: 166, 169–170.    Material examined    Paralectotypes( lectotypedesignated by Cai & Ng 2007)  INDONESIA• 2 ♂♂, cl 3.5–3.7 mm, 1 ♀ovig., cl 5.1 mm; Sulawesi, Balangnipa;  Oct.–Nov. 1888; M. Weberleg.; MNHN-IU-2015-1737.  Other material   SOLOMON ISLANDS– Kolombangara Island• 1 ♂, cl 3.0 mm; Jack Harbour River; 08°03.085´S, 157°10.945´E;  11 ma.s.l.;  11 Nov. 2015; P. Keith, C. Lordand G. Marquetleg.; DNA voucher: CA1497; MNHN-IU-  2018-2804. –  Isabel   Island• 1 specimen; Kolopakissa, Zari River; 07°36.314´S, 158°40.103´E; ca  0–5 ma.s.l.;  26 Oct. 2019; P. Keith, C. Lord, R. Causseand D. Bosetoleg.; DNA voucher: CA2506; MNHN.   AUSTRALIA• 1 ♂, cl 4.2 mm; Queensland, Johnstone River; 17°30.456´S, 145°59.525´E;  7 ma.s.l;  11 Jun. 2016; B. Mosleg.; DNA: CA1677; MNHN-IU-  2018-2805•  1 ♀ovig., cl 5.6 mm; Queensland, Mulgrave River; 17°08.841´S, 145°52.786´E;  10 ma.s.l.;  7 Jun. 2016; B. Mosleg.; DNA voucher: CA1681; MNHN-IU-  2018-2806• 1 ♂, cl 4.2 mm; same collection data as for preceding; MNHN-IU-  2018-2807.    Description CEPHALOTHORAX. Antennal spine short, situated below inferior orbital angle. Pterygostomian margin subrectangular. Rostrum ( Fig. 4m): strongly upturned, very long, 1.3–2.6 of cl, reaching far beyond distal end of scaphocerite, armed with 5–9 teeth on dorsal margin, with 1–2 apical teeth, 0–1 of them situated on carapace behind orbital margin, ventral margin with 21–35 teeth. Eyes well developed, anterior end reaching to 0.54–0.87 length of basal segment of antennular peduncle. Antennular peduncle 0.70 ( ♀) – 0.93 (♂) times as long as carapace. Anterolateral angle pointed, reaching to 0.40 length of second segment, second segment distinctly longer than third segment. Stylocerite reaching to 0.72–0.80 length of basal segment of antennular peduncle. PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 4a): chela about 1.9–2.9 times as long as wide, movable finger 2.8–4.0 times as long as wide, 0.7–1.3 times length of palm; carpus 1.5–1.9 times as long as wide. P2 ( Fig. 4b) more slender and longer than first pereiopod, with chela 2.0–2.5 times as long as wide: movable finger 3.3–4.2 times as long as wide, 1.1–1.8 times length of palm; carpus slender, 3.2–5.1 times as long as wide. P3 ( Fig. 4c): dactylus stout ( Fig. 4e), 3.3–3.8 times as long as wide (terminal spiniform seta included), with 7–10 spiniform setae on flexor margin in addition to terminal one; propodus 11.7–14.0 times as long as wide, 3.6–4.5 times as long as dactylus. P5 ( Fig. 4d): dactylus ( Fig. 4f) 4.0–4.4 as long as wide, with 26–33 spiniform setae on flexor margin; propodus 14.9–22.4 times as long as wide, 3.8–4.4 times as long as dactylus.   Fig. 4.  Caridina gracilirostris( De Man, 1892). a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Preanal carina. h. Uropodal diaeresis. i. Telson. j. First male pleopod. k. Second male pleopod. l. Eggs. m. Cephalothorax. MNHN-IU-2018-2804 (a–b, d, f–k), MNHN-IU-2018-2805 (c,e,m) and MNHN- IU-2018-2807 (l). ABDOMEN. Third abdominal somite with moderarely convex dorsal profile. Sixth abdominal somite 0.8 times as long as carapace, 2.0 times as long as fifth somite, as long as telson. TELSON ( Fig. 4i). Very slender, 4.5 times as long as wide, with four pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin without a median process; distal setae very stout, lateral pair distinctly longer than intermediate setae (mostly one pair). MALE PLEOPODS. Pl1 ( Fig. 4j): endopod subtriangular, 2.1 times as long as wide, 0.21 times as long as exopod, without appendix interna. Pl2 ( Fig. 4k): appendix masculina reaching 0.50 times length of endopod; appendix interna reaching 0.50 of appendix masculina. PRE- ANAL CARINA ( Fig. 4g). With spine. UROPODAL DIAERESIS ( Fig. 4h). With 6–10 spinules. EGGS ( Fig. 4l). Size: 0.34–0.43 × 0.19–0. 26 mm.   Habitat In the lower course of streams under marine influence, very often in brackish water.  Colour pattern( Fig. 25A) Totally translucent body with a rostrum alternating black and red areas.    Distribution Widely distributed in the tropical and subtropical Indo-Pacific region: Indonesia, the Philippines, India, Australiaand the Solomon Islands.    Remarks Our specimens fit well with the description given by Cai & Ng (2007): rostrum very long, reaching far beyond distal end of scaphocerite, strongly upturned, with presence of 0–1 postorbital teeth (vs 0 in Cai & Ng (2007)), 5–9 dorsal teeth (vs 3–9) and 21–35 ventral teeth (vs 28–36); P1 carpus 1.5–1.9 times as long as wide (vs 1.7); P2 carpus 3.2–5.1 times as long as wide (vs 4). P3 dactylus with 7–10 spiniform setae (vs 8), propodus 3.6–4.5 times as long as dactylus (vs 4.0); P5 dactylus with about 26–33 spiniform setae (vs 37) and propodus 3.8–4.4 times as long as dactylus (vs 3.8); uropodal diaeresis 6–10 (vs 5–11); small eggs 0.32–0.43 × 0.19–0.26 mm(vs 0.40 × 0.25 mm); no appendix interna on the endopod of the male first pleopod. 2824256359 [234,910,803,830] 1888-10 1888-11-31 1888-10 M. Weber Indonesia Balangnipa 11 12 1 1 Sulawesi Utara paralectotype 2824256402 2015-11-11 2804 2015-11-11 P. Keith & C. Lord & G. Marquet Solomon Islands 11 -8.051416 Jack Harbour River 1 157.18242 11 12 1 Isabel 2824256625 2019-10-26 MNHN P. Keith & C. Lord & R. Causse & D. Boseto Solomon Islands 3 -7.605233 Zari River 1 158.66838 Kolopakissa 11 12 1 Island 2824256332 2016-06-11 2805 2016-06-11 B. Mos Australia 7 -17.5076 Johnstone River 1 145.99208 11 12 1 Queensland 2824256610 2016-06-07 2806 2016-06-07 B. Mos Australia 10 -17.14735 Mulgrave River 1 145.87976 11 12 1 1 Queensland 2824256369 2018 2807 2018 MNHN- B. Mos Australia 10 -17.14735 Mulgrave River 1 145.87976 11 12 1 Queensland