Caridina intermedia, Mazancourt & Boseto & Marquet & Keith, 2020

Mazancourt, Valentin de, Boseto, David, Marquet, Gerard & Keith, Philippe, 2020, 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, European Journal of Taxonomy 696, pp. 1-86 : 23-26

publication ID

https://doi.org/10.5852/ejt.2020.696

publication LSID

lsid:zoobank.org:pub:265EDD08-7AA8-4835-B7F6-353E7992633E

DOI

https://doi.org/10.5281/zenodo.4336384

persistent identifier

https://treatment.plazi.org/id/7A52CFEB-5BA8-483F-9C70-69958430DF8E

taxon LSID

lsid:zoobank.org:act:7A52CFEB-5BA8-483F-9C70-69958430DF8E

treatment provided by

Valdenar

scientific name

Caridina intermedia
status

sp. nov.

Caridina intermedia sp. nov.

urn:lsid:zoobank.org:act:7A52CFEB-5BA8-483F-9C70-69958430DF8E

Figs 2I View Fig , 7 View Fig , 25F View Fig

Caridina sp. Sol.2 – Page et al. 2007: 649 (GenBank: DQ478545 View Materials ).

Caridina sp. 1 Solomon – de Mazancourt et al. 2019a: 166, 169–170.

Etymology

Caridina intermedia sp. nov. was named for its intermediate morphometry between those of C. brevidactyla and C. grandirostris .

Material examined

Holotype

SOLOMON ISLANDS • ♀, cl 5.4 mm; Choiseul Island, Gu’ma River ; 07°01.764´S, 156°49.899´E; 50 m a.s.l.; 17 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU-2014-20840. GoogleMaps

Paratypes

SOLOMON ISLANDS – Choiseul Island • 1 ♀ ovig., cl 5.4 mm; Lokasereke River ; 06°58.024´S, 156°47.861´E; 13 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU-2014-20841 GoogleMaps 1 ♀ ovig., cl 4.9 mm; same collection data as for preceding; MNHN-IU-2014-20842 GoogleMaps 1 ♂, cl 3.4 mm; same collection data as for preceding; MNHN-IU-2014-20843 GoogleMaps 1 ♂, cl 3.4 mm; Pisuku River , downstream; 06°58.848´S, 156°46.582´E; 12 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; DNA voucher: CA1326; MNHN-IU-2014-20844 GoogleMaps 1 ♂, cl 3.5 mm; same collection data as for preceding; MNHN- IU-2014-20845 GoogleMaps 1 ♂, cl 3.7 mm; same collection data as for preceding; MNHN-IU-2014-20846 GoogleMaps . – Kolombangara Island • 1 ♂, cl 3.5 mm; Poitete River ; 07°52.413´S, 157°07.982´E; 15 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; DNA voucher: CA1499; MNHN-IU-2014-20847 GoogleMaps . – Vella Lavella Island • 1 ♂, cl 3.1 mm; Vala Kadju River ; 07°49.860´S, 156°42.644´E; 28 Oct. 2016; P. Keith and C. Lord leg.; MNHN-IU-2014-20848 GoogleMaps 1 ♀ ovig., cl 3.9 mm; same collection data as for preceding; MNHN-IU-2014-20849 GoogleMaps 1 ♂, cl 2.8 mm; Joroveto River ; 07°49.918´S, 156°42.887´E; 28 Oct. 2016, P. Keith and C. Lord leg.; MNHN-IU-2014-20850 GoogleMaps 1 ♀ ovig., cl 3.9 mm; same collection data as for preceding; MNHN-IU-2014-20851 GoogleMaps . – Isabel Island • 1 specimen; Rakata River ; 15 m a.s.l.; 07.64456° S, 158.71918° E; 27 Oct. 2019; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2509; MNHN GoogleMaps 1 specimen; same collection data as for preceding; DNA voucher: CA2510; MNHN GoogleMaps .

Other material

PAPUA NEW GUINEA – New Britain • 1 ♂, cl 4.1 mm; Ore River ; 05°43.145´S, 49°34.128´E; 25 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20852 GoogleMaps 1 ♀ ovig., cl 5.7 mm; same collection data as for preceding; MNHN-IU-2014-20853 GoogleMaps 1 ♀ ovig., cl 6.3 mm; same collection data as for preceding; MNHN-IU-2014-20854 GoogleMaps 1 ♀ ovig., cl 5.7 mm; same collection data as for preceding; MNHN-IU-2014-20855 GoogleMaps 1 ♂, cl 4.3 mm; Garu road; 05°27.278´S, 149°58.415´E; 26 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20856 GoogleMaps 1 ♀, cl 4.5 mm; same collection data as for preceding; MNHN-IU-2014-20857 GoogleMaps 1 ♂, cl 4.2 mm; Galuku River ; 05°45.187´S, 150°35.001´E; 20 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20858 GoogleMaps 1 ♀ ovig., cl 5.9 mm; same collection data as for preceding; MNHN-IU-2014-20859 GoogleMaps 1 ♀ ovig., cl 5.4 mm; Kokori River ; 05°42.650´S, 150°37.693´E; 22 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20860 GoogleMaps 1 ♀ ovig., cl 5.7 mm; Rangihi swamp; 05°34.549´S, 149°28.943´E; 24 Oct. 2018; R. Causse, P. Keith and C. Lord leg.; MNHN-IU-2014-20861 GoogleMaps .

Comparative material

Caridina longirostris (H. Milne Edwards, 1837)

See de Mazancourt et al. 2018c.

Caridina appendiculata ( Jalihal & Shenoy, 1998)

See de Mazancourt et al. 2018c.

Caridina brevidactyla ( Roux, 1919)

See de Mazancourt et al. 2018c.

Caridina gracilipes ( De Man, 1892)

See de Mazancourt et al. 2018c.

Description

CEPHALOTHORAX. Carapace ( Fig. 7m View Fig ) smooth, glabrous, with sharp antennal spine placed at lower orbital angle. Pterygostomial margin subrectangular. Long rostrum, 1.1–1.8 of cl, curved up distally, reaching well beyond scaphocerite. 16–26 dorsal teeth closely set, leaving 0.4–1.3 unarmed distally except for one or two subapical teeth, 1–3 post-orbital teeth present. 9–20 teeth present of ventral margin, extending from proximal end either to tip or with short distal part unarmed. Number of dorsal teeth on rostrum before first ventral tooth 11–16. Eyes well developed, anterior end reaching to 0.60–0.63 length of basal segment of antennular peduncle. Antennular peduncle 0.69 (♀) – 0.90 (♂) times as long as carapace. Anterolateral angle pointed reaching to 0.37 length of the second segment; second segment distinctly longer than third segment. Stylocerite reaching to 0.83–0.90 length of basal segment of antennular peduncle.

PEREIOPODS. Slender P1 ( Fig. 7a View Fig ): chela about 2.0–2.4 times as long as wide, dactylus 3.4–4.2 times as long as wide, 1.1–1.5 length of palm; carpus 2.4–3.1 times as long as wide, with shallow excavation on anterior margin. P2 ( Fig. 7b View Fig ) more slender and longer than first pereiopod: chela 2.3–2.9 times as long as wide, dactylus 4.1–5.4 times as long as wide, 1.1–1.6 times length of palm; carpus 5.8–6.7 times as long as wide. P3 ( Fig. 7c View Fig ): dactylus ( Fig. 7e View Fig ) 2.9–4.2 times as long as wide, with 6–7 spiniform setae on flexor margin in addition to terminal one; propodus 15.3–21.7 times as long as wide, 4.4–6.6 times as long as dactylus. P5 ( Fig. 7d View Fig ): dactylus ( Fig. 7f View Fig ) 4.1–5.6 long as wide, with 31–59 spiniform setae on flexor margin; propodus 18.9–27.9 times as long as wide, 4.7–6.1 as long as dactylus.

ABDOMEN. Typical dorsal hump over third abdominal somite, sixth abdominal somite 0.74 as long as carapace, 1.9 times as long as fifth somite, 1.0 times as long as telson.

TELSON ( Fig. 7i View Fig ). 3.8 times as long as wide, with four pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin with median process, distal setae short, lateral pair slightly longer than intermediate setae (4).

MALE PLEOPODS. Pl1 ( Fig. 7j View Fig ): endopod subtriangular, 2.2 times as long as wide, 0.22 times as long as exopod, with appendix interna placed on subdistal outer margin. Pl2 ( Fig. 7k View Fig ): appendix masculina reaching 0.55 times length of endopod; appendix interna reaching 0.90 of appendix masculina.

PRE- ANAL CARINA ( Fig. 7g View Fig ). With spine.

UROPODAL DIAERESIS ( Fig. 7h View Fig ). With 9–14 spinules.

EGGS ( Fig. 7l View Fig ). Size: 0.33–0.43 × 0.20–0.25 mm.

Habitat

All specimens were collected in a typical brackish water environment (brackish water pool or lower part of rivers, near the estuary). In rivers of Solomon Islands, C. intermedia sp. nov. is syntopic with C. brevidactyla and C. appendiculata .

Colour pattern ( Fig. 25F View Fig )

The colour of the body is hyaline with many reds dots.

Distribution

Caridina intermedia sp. nov. is known from the Solomon Islands (Choiseul, Kolombangara, Vella Lavella and Isabel) and Papua New Guinea (New Britain).

Remarks

Caridina intermedia sp. nov. differs from C. longirostris by its longer P1 and P2 carpus, respectively 2.4–3.1 (vs 1.4–1.8 in C. longirostris ) and 5.8–6.7 (vs 4.0–4.2) times as long as wide, a stouter P3 dactylus 2.9–4.2 (vs 4.0–4.8) times as long as wide, with propodus 4.4–6.6 (vs 3.4–4.1) times as long as dactylus, and a stouter P5 propodus, 4.1–5.6 (vs 3.2–3.5) times as long as dactylus. C. intermedia sp. nov. has an appendix interna on the endopod of the male first pleopod (vs none).

Caridina intermedia sp. nov. differs from C. appendiculata by its greater number of teeth on the proximal part of the dorsal margin of the rostrum, 16–26 closely set (vs 12–17 teeth somewhat irregular spaced in C. appendiculata ), greater number of dorsal teeth before the first ventral teeth 11–16 (vs 8–12) and a slightly greater number of spiniform setae on the dactylus of the fifth pereiopod 31–59 (vs 33–44).

Caridina intermedia sp. nov. differs from C. gracilipes by its longer P2 carpus, 5.8–6.7 (vs 4.4–5.9 in C. gracilipes ), by a lower number of spiniform setae on the dactylus of the third pereiopod, 6–7 (vs 9–10), with its more slender P3 propodus, 4.4–6.6 times as long as dactylus (vs 3.8–4.6), and its longer and more slender P5 propodus, 18.9–27.9 times as long as wide (vs 16.2–19.3).

Caridina intermedia sp. nov. is similar to C. grandirostris and C. brevidactyla by its rostrum with a similar number of dorsal teeth, 16–26 (vs 17–21 in C. grandirostris and 17–30 in C. brevidactyla ). However, even though C. intermedia sp. nov. like C. grandirostris always has a pre-anal carina with a spine, C. brevidactyla never has one. C. intermedia sp. nov. can be separated from C. grandirostris by its greater P3 dactylus, 2.9–4.2 (vs 2.3–2.9 in C. grandirostris ), its longer P3 propodus, 15.3–21.7 times as long as wide (vs 13–15), and its longer P5 propodus, 18.9–27.9 times as long as wide (vs 13.4–16.1).

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Atyidae

Genus

Caridina

Loc

Caridina intermedia

Mazancourt, Valentin de, Boseto, David, Marquet, Gerard & Keith, Philippe 2020
2020
Loc

Caridina

de Mazancourt V. & Klotz W. & Marquet G. & Mos B. & Rogers D. C. & Keith P. 2019: 166
2019
Loc

Caridina

Page T. J. & von Rintelen K. & Hughes J. M. 2007: 649
2007