Caridina congoensis , Jasmine Richard & Paul F. Clark, 2009

Jasmine Richard & Paul F. Clark, 2009, African Caridina (Crustacea: Decapoda: Caridea: Atyidae): redescriptions of C. africana Kingsley, 1882, C. togoensis Hilgendorf, 1893, C. natalensis Bouvier, 1925 and C. roubaudi Bouvier, 1925, Zootaxa 1995, pp. 1-75: 48-51

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Caridina congoensis

sp. nov.

Caridina congoensis  sp. nov.

( Figs. 24 View Figure , 25 View Figure )

Material examined. Holotype: ♂ Congo Paratypes: 3♂ Bakou, 12– 19.6.1984, in river, in total darkness, 30 m depth, coll. T. Montreille et al., pres. Dr. L. Deharveng, 2.1989, RMNHAbout RMNH D 37639.

Description. Total length: 14–15 mm. Carapace length: 3.5–4 mm.

Rostrum ( Fig. 24a, b, c View Figure ): extending between middle of first to second segment of antennular peduncle. 1.4–1.5 mm in length. 0.4 × long as carapace. 13–16 teeth on dorsal margin arranged almost to tip. 3–5 postorbital teeth. 1–3 teeth on ventral margin leaving short distal end unarmed. Tip pointed. Formula (3–5) 13–16/ 1–3.

Antennular peduncle ( Fig. 24d View Figure ): 0.45–0.5 × carapace. Stylocerite 0.9–1 × length of basal segment. Anterolateral teeth of basal segment 0.4–0.45 × second segment. 11–12 segments bearing aesthetascs.

First pereiopod ( Fig. 25a View Figure ): dactylus 1–1.1 × palm of propodus. Chela 2–2.1 × long as broad. Carpus 1.5–1.6 × long as broad with anterior excavation.

Second pereiopod ( Fig. 25b View Figure ): dactylus 1.1–1.2 × long as palm of propodus. Chela 2.4–2.5 × long as broad. Carpus 5–5.5 × long as broad.

Third pereiopod ( Fig. 25c, d View Figure ): dactylus 1.7–1.8 × long as broad. Spines on dactylus varying from 4–5 (including terminal spines). Propodus 4.5–5 × long as dactylus and 7–8 × long as broad with 10–12 spines along posterior margin. Carpus 0.75–0.8 × long as propodus, with minute spines on inner margin. Merus 1.6–1.7 × carpus length. Merus with 2 spines on posterior margin.

Fifth pereiopod ( Fig. 25e, f View Figure ): dactylus 3–3.3 × long as broad with 50–55 spines arranged in comb-like fashion on inner margin. Propodus 10–11 × long as broad and 3.8–4 × long as dactylus with 16–18 spines along inner margin. Carpus 0. 5–0.6 × propodus length and with minute spines along inner margin. Merus 1.5–1.6 × carpus length, with 2 spines at posterior margin.

Setobranchs: 2 on all pereiopods.

First male pleopod ( Fig. 25g, h View Figure ): endopod long 0.6 × exopod length. Appendix interna absent. Several short stalked setae arranged along entire margin.

Second male pleopod ( Fig. 25i, j View Figure ): appendix masculina long, 2.1–2.2 × appendix interna. 0.5–0.55 × endopod.

Sixth abdominal somite: 0.4–0.5 × long as carapace.

Telson ( Fig. 25k, l View Figure ): 1.1 to 1.2 × long as sixth abdominal somite. Dorsal spines 5–6 pairs (including sub terminal spine). 1 pair of short lateral spines and 7 or 9 long sparsely plumose spines increasing in length towards centre, present at posterior margin of telson.

Uropod ( Fig. 25m, n View Figure ): 13–14 diaeresis spinules.

Preanal carina ( Fig. 25o View Figure ): Peg-like with bushy setae.

Remarks. Caridina congoensis  sp. nov. is characterised by: the smaller size of the adult (14–15 mm); a short rostrum that is shorter than the first segment or extending to the middle of the second segment of the antennular peduncle; the stylocerite is 0.9–1.0 × the first segment, anterolateral tooth 0.40–0.45 × the second segment of the antennular peduncle; the dactylus of the third pereiopod bears 4–5 spines; the endopod of the first pleopod of male is longer, appendix masculina 2.1–2.2 × longer than the appendix interna; and the posterior margin of the telson bears long, sparsely plumose spines and the uropod diaeresis with 13–14 spinules. This combination of characters distinquishes C. congoensis  sp. nov. from C. africana  and C. togoensis  .

At present, females of C. congoensis  are not known and examination of more extensive collections from the type locality including females, would provide information on egg number and size, and add to the present findings.

Etymology. Named congoensis  , after the Congo, the region from where the species is recorded.


National Museum of Natural History, Naturalis