Caridina messofluminis , 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: 66-69

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Caridina messofluminis

sp. nov.

Caridina messofluminis  sp. nov.

( Figs. 36 View Figure , 37 View Figure )

Material examined. Holotype: ♂ Cameroon Mess stream, coll. R. H. L. Disney, 5.11.1970, NHMAbout NHM 1974.707. Paratypes: Mess stream, coll. R. H. L. Disney, 5.11.1970, NHMAbout NHM 2007.747–756, (ex 1974. 707) 13♂.

Description. Total length: 15–25 mm. Carapace length: 2.5–4.5 mm.

Rostrum ( Fig. 36a, b, c View Figure ): short, equal to, or overreaching first segment of antennular peduncle. 0.9–1.25 mm in length. 0.25–0.36 × carapace. 2–9 teeth on dorsal margin leaving 0.3–0.6 of length distally unarmed. 1–5 post-orbital teeth. Teeth absent on ventral margin. Tip pointed. Formula (1–5) 2–9/0.

Antennular peduncle ( Fig. 36d View Figure ): 0.45–0.6 × carapace. Basal segment of antennular peduncle with stylocerite reaching 0.8–0.9 × basal segment. Anterolateral tooth of basal segment short being 0.08 to 0.1 × second segment. 9–11 segments bearing aesthetascs.

First pereiopod ( Fig. 37a View Figure ): dactylus 1.1–1.4 × palm of propodus. Chela 2.1–2.4 × long as broad. Carpus 2.2–2.5 × long as broad. Carpus with deep excavation anteriorly.

Second pereiopod ( Fig. 37b View Figure ): dactylus 1.3–1.55 × long as palm of propodus. Chela 2.7–3.0 × long as broad. Carpus 4.5–5.0 × long as broad.

Third pereiopod ( Fig. 37c, d View Figure ): dactylus 2–2.8 × long as broad with 5–7 spines (including spine at anterior end). Propodus 4.5–5.0 × long as dactylus and 8–9 × long as broad. 7–10 spines arranged along posterior margin. Carpus 0.6–0.7 × propodus. Merus 1.5–1.7 × carpus with 3 large spines.

Fifth pereiopod ( Fig. 37e, f View Figure ): dactylus 3.5–3.8 × long as broad with 55–65 spines arranged in comb-like fashion on posterior margin. Propodus 3.4–3.7 × long as dactylus and 10–11 × long as broad. Merus 1.3–1.4 × carpus and with three spines on posterior margin.

Setobranchs: 3 on all pereiopods.

First male pleopod ( Fig. 37g, h View Figure ): endopod long 0.6–0.7 × exopod and with short appendix interna. Short stalked setae arranged uniformly around inner margin and longer ones along outer margin.

Second male pleopod ( Fig. 39i, j View Figure ): appendix masculina 1.5–1.6 × appendix interna and 0.4–0.55 × exopod.

Sixth abdominal segment: 0.45–0.6 × long as carapace.

Telson ( Fig. 37k, l View Figure ): 5 to 6 pairs of dorsal spines (including subterminal spines). Posterior margin rounded with 1 plain lateral spines and 3–4 pairs of long, stalked densely plumose processes. 1–1.2 × long as sixth abdominal segment.

Uropod ( Fig. 37m, n View Figure ): 20–22 diaeresis spinules.

Preanal carina ( Fig. 37o View Figure ): Protruding and peg-like without spines and adorned with long setae at tip.

Remarks. The short, pointed rostrum (not reaching the end of the eye in three specimens, and slightly overreaching the first segment of the antennular peduncle in 9 specimens), with 2–9 teeth on dorsal margin of the rostrum arranged proximally leaving 0.3 to 0.5 of the dorsal margin of the rostrum unarmed, and no teeth on the ventral margin, differentiate this species from C. africana  and C. togoensis  . Caridina messofluminis  sp. nov. is closer to C. gabonensis J. Roux, 1927  . However, C. messofluminis  sp. nov. differs from C. gabonensis  in having relatively fewer post-orbital teeth; 1–5 and 3–6 respectively. Caridina messofluminis  sp. nov. possesses no teeth on the ventral margin of the rostrum, but, Roux (1927) reported that 15 of the specimens examined by him had one tooth on the ventral margin of the rostrum. Caridina messofluminis  sp. nov. possesses 20–22 uropod diaeresis spines, while only 15 or 16 are present in C. gabonensis  . The endopod of the first pleopod of the male in C. messofluminis  sp. nov. is long, about 0.6–0.7 × as long as the exopod, and bears a short appendix interna. No information is available on this character in C. gabonensis  . Examination of extensive collections from type locality might provide further support for the distinctness of C. messofluminis  sp. nov. Based on the differences in the absence of ventral teeth, fewer post-orbital teeth, more uropod diaeresis spinules and longer endopod on the first pleopod of male with a short appendix interna, C. messofluminis  sp. nov. is described as a new species. Females are not presently known.

Etymology. The species name is derived from Flumineus, Latin, meaning river, and the Mess stream, the type locality.


University of Nottingham