Caridina lineorostris , 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: 51-54

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Caridina lineorostris

sp. nov.

Caridina lineorostris  sp. nov.

( Figs. 26 View Figure , 27 View Figure )

Material examined. Holotype: ♂ Gabon Keri, Forest stream, 20 km North of Lambarene, 15.11.1984, NHMAbout NHM 1988: 35. Paratypes: 0°34.5'S 10°28.4'E, 5.4.1994, in small stream; coll. & pres. J. J. Wieringa & R. M. A. P. Haegens, RMNHAbout RMNH D 45560, 3♂; Keri, Forest stream, 20 km North of Lambarene, 15.11.1984, NHMAbout NHM 1988.35, 21♂, 18♀ ovig., 7♀.

Description. Total length: 22–28 mm. Carapace length: 3.85–3.9 mm.

Rostrum ( Fig. 26a, b, c View Figure ): Straight, equal to or fractionally longer than antennal scale. 3.9–4 mm in length. Equal to or fractionally longer than carapace. 22–34 teeth on dorsal margin arranged to tip. 3–5 post-orbital teeth. 3–15 teeth on ventral margin leaving distal end unarmed. Tip pointed. Formula (3–5) 22–34/3–15, mostly (4–5) 25–31/7–15.

Antennular peduncle ( Fig. 26d View Figure ): 0.75 × carapace. Stylocerite 0.7–90 × length of basal segment. Anterolateral teeth of basal segment 0.4–0.5 × second segment. 5–21 segments bearing aesthetascs.

First pereiopod ( Fig. 27a View Figure ): dactylus 1.1–1.2 × palm of propodus. Chela 1.9–20 × long as broad. Carpus 2.2–2.3 × long as broad with shallow excavation at anterior margin.

Second pereiopod ( Fig. 27b View Figure ): dactylus 1.4 × long as palm of propodus. Chela 2.57 × long as broad. Carpus 5.5 × long as broad.

Third pereiopod ( Fig. 27c, d View Figure ): dactylus 2.3–2.5 × long as broad. Spines on dactylus ranging from 6–9 (including terminal spines). Propodus 4.8–5.5 × long as dactylus and 9–11 × long as broad with 10–12 spines arranged along posterior margin. Carpus 0.6–0.7 × long as propodus, with minute spines on inner margin. Merus 1.8–2 × carpus length. Merus with 3 spines on posterior margin.

Fifth pereiopod ( Fig. 27e, f View Figure ): dactylus 3.6 × long as broad with 45–55 spines arranged in comb-like fashion on inner margin. Propodus 12–13 × long as broad and 3.2–4 × long as dactylus with 10–11 spines along inner margin. Carpus 0.6–0.7 × propodus length and with minute spines along inner margin. Merus 1.5–1.7 × carpus length, with 3 spines at posterior margin.

Setobranchs: 2 on all pereiopods.

First male pleopod ( Fig. 27g, h View Figure ): endopod 0.35–0.45 × exopod length. Appendix interna absent. Several long, stalked setae arranged along outer margin and short stalked setae along inner margin.

First female pleopod ( Fig. 27i View Figure ): endopod 0.5–0.6 × exopod.

Eggs ( Fig. 27j View Figure ) 20–30, 1–1.1 × 0.6–0.65mm in size.

Second male pleopod ( Fig. 27k, l View Figure ): appendix masculina1.4–1.5 × appendix interna. 0.3–0.4 × endopod.

Sixth abdominal somite: 0.7 × long as carapace.

Telson ( Fig. 27m, n View Figure ): 0.9–1 × long as sixth abdominal somite. Dorsal spines 4–6 pairs (including sub terminal spine). 1 pair of long lateral spines and 2–3 pairs (mostly 2 pairs) or 5 slender stalked plumose processes of equal length, present at posterior margin.

Uropod ( Fig. 27o, p View Figure ): 6–12 diaeresis spinules.

Preanal carina ( Fig. 27q View Figure ): unarmed.

Remarks. Caridina lineorostris  sp. nov. is unique in the combination of a straight rostrum, with the apex reaching or fractionally overreaching the antennal scale, having more teeth on the dorsal margin (22–34) arranged compactly up to the tip; ventral teeth 3–15 arranged compactly on proximal ventral margin leaving distal 0.2–0.6 of ventral margin always unarmed; 3–5 post-orbital teeth; telson tapering with a pair of longer lateral spines and with 2 pairs or 5 slender stalked plumose processes of equal length at posterior margin and fewer number of eggs (20– 30 eggs).

The straight, long, rostrum and the characteristic arrangement of the teeth on the rostrum distinguishes C. lineorostris  sp. nov. from C. africana  and C. togoensis  .

Etymology. Caridina lineorostris  sp. nov. is named from the Latin meaning straight rostrum.


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National Museum of Natural History, Naturalis