Caridina poarae, 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 : 64-65

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scientific name

Caridina poarae

sp. nov.

Caridina poarae   sp. nov.

Figs 2R View Fig , 21 View Fig


This new species is named after the local name of the type locality, river Poarae. The name is used as an apposition.

Material examined


SOLOMON ISLANDS • ♀, cl 4.1 mm; Ranongga Island , Poarae River; 08°05.028´S, 156°35.979´E; 25 Oct. 2016; D. Boseto leg.; DNA voucher: CA2350; MNHN-IU- 2018-2920. GoogleMaps  


SOLOMON ISLANDS • 1 juvenile, cl 2.9 mm; same collection data as for holotype; DNA voucher: CA2348; MNHN-IU- 2018-2921 GoogleMaps   1 ♀ ovig., cl 3.4 mm; same collection data as for holotype; DNA voucher: CA2349; MNHN-IU- 2018-2922 GoogleMaps   .

Other material

VANUATU • 1 ♀ ovig., cl 5.3 mm; Santo Island ; MNHN-IU- 2018-2923   1 ♀, cl 5.3 mm; same collection data as for preceding; MNHN-IU- 2018-2924   .


CEPHALOTHORAX. Suborbital angle indistinguishably fused with antennal spine. Pterygostomian margin broadly subrectangular. Rostrum ( Fig. 21k View Fig ): straight, short, 0.3 of cl, reaching to near end of first segment of antennular peduncle, unarmed dorsally, ventral margin with 1–3 teeth. Eyes well developed. Antennular peduncle 0.54 times as long as carapace. Anterolateral angle reaching 0.33 length of second segment, second segment little longer than third segment. Stylocerite reaching to 0.83 times length of basal segment of antennular peduncle.

PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 21a View Fig ): chela about 2.0–2.3 times as long as wide, movable finger 2.3–3.2 times as long as wide, 0.8–1.2 times length of palm; carpus 1.3–1.7 times as long as wide. P2 ( Fig. 21b View Fig ) more slender and longer than first pereiopod, with chela 1.4–3.8 times as long as wide: movable finger 4.7–4.9 times as long as wide, 1.4–1.6 times length of palm; carpus slender, 4.5–5.7 times as long as wide. P3 ( Fig. 21c View Fig ): stout, dactylus ( Fig. 21e View Fig ) 2.9–3.0 times as long as wide (terminal spiniform seta included), with 5–6 spiniform setae on flexor margin including terminal; propodus 6.7–7.7 times as long as wide, 3.2–3.7 times as long as dactylus. P5 ( Fig. 21d View Fig ): dactylus ( Fig. 21f View Fig ) 3.9–4.5 times as long as wide, with 42–61 spiniform setae on flexor margin; propodus 9.6– 13.8 times as long as wide, 2.9–3.5 times as long as dactylus.

ABDOMEN. Third abdominal somite with moderately convex dorsal profile. Sixth abdominal somite 0.48 times as long as carapace, 1.5 times as long as fifth somite, shorter than telson.

TELSON ( Fig. 21i View Fig ). 2.7 times as long as wide, with four or five pairs of dorsal spinules and pair of dorsolateral spinules, posterior margin with median process, rounded, with 5–8 plumose intermediate setae longer than lateral ones.


PRE- ANAL CARINA ( Fig. 21g View Fig ). High, unarmed.

UROPODAL DIAERESIS ( Fig. 21h View Fig ). With 19–24 spinules.

EGGS. Ovigerous females with eggs size: 0.42–0.49 × 0.22–0.32 mm.


This new species is rheophile and prefers fresh and well-oxygenated waters from the middle to upper course of rivers.

Colour pattern



This species occurs in Solomon Islands (Ranongga) and Vanuatu (Santo).


This new species looks like C. typus by its unarmed dorsal rostrum, but it is distinguished by its shorter P3 propodus, 6.7–7.7 times as long as wide (vs 7.9–10.0 in C. typus), and P3 propodus 3.2–3.7 times as long as dactylus, (vs 3.6–4.6). This new species also looks like C. jeani   , by its unarmed dorsal rostrum but it is easily distinguish by its longer P3 dactylus, 4.4–4.6 times as long as wide (vs 1.6 in C. jeani   ) and its P5 dactylus, 3.9–4.5 times as long as wide (vs 2.7–3.2).