Caridina sikipozo, 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 : 62-64
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Caridina sikipozo sp. nov.
This species is named after the Sikipozo tribe living around the type locality.
SOLOMON ISLANDS • ♂, cl 3.2 mm; Choiseul Island, Lokataveva Creek ; 06°59.085´S, 156°47.454´E; 93 m a.s.l.; 14 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; DNA voucher: CA1928; MNHN- IU- 2018-2914. GoogleMaps
SOLOMON ISLANDS • 1 ♂, cl 3.1 mm; same collection data as for holotype; DNA voucher: CA2310; MNHN-IU- 2018-2915 GoogleMaps .
CEPHALOTHORAX. Suborbital angle indistinguishably fused with antennal spine. Rostrum ( Fig. 20j View Fig ): bent down, short, 0.3–0.4 of cl, reaching end of first segment of antennular peduncle, armed with 14–17 teeth on dorsal margin, 2–3 of them situated on carapace behind orbital margin, ventral margin with 4–5 teeth. Eyes well developed, anterior end reaching to 0.70 length of basal segment of antennular peduncle. Antennular peduncle 0.63 (♂) times as long as carapace. Pointed anterolateral angle reaching 0.31 length of second segment, second segment longer than third segment. Stylocerite reaching to 0.94 length of basal segment of antennular peduncle.
PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 20a View Fig ): chela about 2.1–2.2 times as long as wide, movable finger 3.4–3.5 times as long as wide, 1.1–1.3 times length of palm; carpus 1.7–1.8 times as long as wide. P2 ( Fig. 20b View Fig ) more slender and longer than first pereiopod, with chela 2.3–2.4 times as long as wide: movable finger 4.7–4.8 times as long as wide, 1.6–1.8 times length of palm; short carpus, 5.2–5.3 times as long as wide. P3 ( Fig. 20c View Fig ): stout, dactylus ( Fig. 20d View Fig ) 3.2 times as long as wide (terminal spiniform seta included), with 6 spiniform setae on flexor margin including terminal one; propodus 10.3–11.3 times as long as wide, 4.3–4.4 times as long as dactylus. P5: missing in all specimens.
ABDOMEN. Third abdominal somite with moderately convex dorsal profile. Sixth abdominal somite 0.48 times as long as carapace, 1.7 times as long as fifth somite, 0.86 times as long as telson.
TELSON ( Fig. 20g View Fig ). 2.3 times as long as wide, eight pairs of dorsal spinules and pair of dorsolateral spinules; posterior margin without median process, rounded, with 6–9 long intermediate setae longer than lateral ones.
MALE PLEOPODS. Pl1 ( Fig. 20h View Fig ): endopod subrectangular, 3 times as long as wide, reaching 0.53 lenght of endopod, with an appendix on subdistal outer margin which reaches beyond distal end of endopod on a short length. Pl2 ( Fig. 20i View Fig ): appendix masculina reaching 0.72 times length of endopod; appendix interna reaching 0.61 lenght of appendix masculina.
PRE- ANAL CARINA ( Fig. 20e View Fig ). High, unarmed.
UROPODAL DIAERESIS ( Fig. 20f View Fig ). With 23 spinules.
This new species is largely rheophile and prefers fresh and well-oxygenated waters in the higher course of rivers.
As far as we know, this new species occurs only on Choiseul ( Solomon Islands).
These specimens from the Solomon Islands are very similar to Caridina turipi sp. nov. by the high number of postorbital teeth on the dorsal margin of the rostrum (2–3 vs 2–4 for C. turipi sp. nov.). However, this new species can be separated by its longer P1 dactylus (3.4–3.5 vs 2.8–3.0 mm), by its shorter P2 chela (2.3–2.4 vs 2.6–3.1 mm) and shorter P2 carpus (5.2–5.3 vs 5.5–6.6 mm).
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