Caridina roubaudi Bouvier, 1925
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: 25-28
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|Caridina roubaudi Bouvier, 1925|
Caridina roubaudi Bouvier, 1925 comb. nov.
Material examined. Syntypes: Congo Brazzaville, E. Roubaud and Weiss 15.6.1907, MNHNAbout MNHN Na 627, 10♂, 23♀ ovig., 46♀ (mostly damaged). The ♀ ovig. specimen with a rostral formula of (3) 14/3 is selected here as the lectotype; the remainder are paralectotypes.
Description. Total length: 11–20 mm. Carapace length: 3.5–5 mm.
Rostrum ( Fig. 9a, b, c View Figure ): usually extending to middle of third segment of antennular peduncle or shorter, rarely extending to end of antennular peduncle. 1.5–2.9 mm in length. 0.4–0.5 × long as carapace. 12–17 (mostly 12–14) teeth on dorsal margin arranged up to tip. 2–4 (mostly 3) post-orbital teeth. 1–7 (mostly 1–4) teeth on ventral margin leaving short distal end unarmed. Tip pointed. Formula (2–4) 12–17/1–7 mostly (3) 12–14/1–4.
Antennular peduncle ( Fig. 9d View Figure ): 0.4–0.6 × carapace. Stylocerite 0.8–1.0 × length of basal segment. Anterolateral teeth of basal segment 0.3–0.6 × second segment. 5–10 segments bearing aesthetascs.
First pereiopod ( Fig. 10a View Figure ): dactylus 0.9–1.2 × palm of propodus. Chela 2.0–2.5 × long as broad. Carpus1.6–2 × long as broad, anterior excavation deep.
Second pereiopod ( Fig. 10b View Figure ): long and slender. Dactylus 1.1–1.4 × long as palm of propodus. Chela 2.3–2.9 × long as broad. Carpus 3.4–4 × long as broad.
Bristle-like setae arranged at tip of chelae of first and second pereiopods.
Third pereiopod ( Fig. 10c, d View Figure ): dactylus 3.0–3.5 × long as broad. 5–9 spines on dactylus (including terminal spines), mostly 6–7. Propodus 4.0–4.8 × long as dactylus and 9–11 × long as broad with 15–20 spines arranged along inner margin. Carpus 0.5–0.6 × long as propodus, with minute spines on inner margin. Merus 1.8–2.0 × carpus length. Merus with 4–5 large spines on posterior margin.
Fifth pereiopod ( Fig. 10e, f View Figure ): dactylus 4–5 × long as broad with 40–50 spines arranged in comb-like fashion on inner margin. Propodus 12–13 × long as broad and 3–4 × long as dactylus with 12–16 spines arranged along posterior margin. Carpus 0.4–0.6 × propodus length and with minute spines along inner margin. Merus 1.5–1.7 × carpus length, with 3 large spines at posterior margin.
Setobranchs: 1 on all pereiopods.
First male pleopod ( Fig. 10g, h View Figure ): endopod 0.4–0.5 × exopod length, appendix interna absent, several setae arranged along margin.
First female pleopod ( Fig. 10i View Figure ): endopod 0.7–0.9 × long as exopod.
Eggs ( Fig. 10j View Figure ): 12–16, 1.1–1.3 × 0.7–0.8 mm in size.
Second male pleopod ( Fig. 10k, l View Figure ): Appendix masculina 1.3–1.5 × appendix interna and 0.4–0.5 × endopod.
Sixth abdominal somite: 0.35–0.5 × long as carapace.
Telson ( Fig. 10m, n View Figure ): broad, 1.0–1.2 × long as sixth abdominal somite. Dorsal spines 3–6 pairs (including sub terminal spine). 1 pair of plain lateral spines and 4–5 pairs or 7or 9 stalked densely plumose setae present at rounded posterior margin.
Uropod ( Fig.10o, p View Figure ): 12–18 (mostly 12–14) diaeresis spinules.
Preanal carina ( Fig. 10q View Figure ): rounded with fine setae along margin, unarmed.
Remarks. Bouvier (1925) described Caridina africana var. roubaudi from Brazzaville, Republic of Congo. The type specimens of this species were examined and found to be distinct from C. africana Kingsley (1882) as well as from C. togoensis Hilgendorf (1893) by following characters. The smaller size of the adults (11–20 mm); shorter rostrum, usually shorter than the antennular peduncle, rarely equal to the antennular peduncle; 12–17 (mostly 12–14) teeth on the dorsal margin of rostrum always arranged to the tip; 1–7 (mostly 1–4) teeth are arranged on the vental margin with an unarmed distal end; stylocerite is 0.8–1.0 of the first segment and the anterolateral tooth 0.3–0.6 × the second antennular peduncle segment; the endopod of the first pleopod of male is 0.4–0.5 × the exopod; the number of uropod diaeresis spinules is 12–18, but mostly 12–14; 12– 16 eggs of 1.1–1.3 × 0.7–0.8 mm size. Consequently, Caridina africana var. roubaudi ( Bouvier, 1925) is here given species status.
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