Caridina amnicolizambezi , 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: 45-48

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Caridina amnicolizambezi

sp. nov.

Caridina amnicolizambezi  sp. nov.

( Figs. 22 View Figure , 23 View Figure )

Material examined. Holotype: ♀ ovig. Angola Rio Lucoge, branch of the Chicapu River, 7°36'S 20°31'E, 4.1964, coll. A. de Barros Machado, no. 6508. Paratypes: Rio Lucoge, branch of the Chicapu River, 7°36'S 20°31'E, 4.1964, coll. A. de Barros Machado, no. 6508. RMNHAbout RMNH D 24469, 3♂, 20♀ ovig., 38♀; SE Angola, Rio Longa, tributary of the Zambesi, received 3.1963, pres. R. Bott, no. 4473, RMNHAbout RMNH D 18639, 10♂, 9♀. Zambia Lake Tanganyika, Chilanga, coll. & pres. Dr. R. Huddart, 1971, NHMAbout NHM 2007.735–744, 3♂, 20♀.

Description. Total length: 15–30 mm. Carapace length: 3–4 mm.

Rostrum ( Fig. 22a, b, c, d View Figure ): straight, or tip turned up, tapering towards tip giving bulged appearnece subterminally; short, mostly reaching end of first segment of antennular peduncle or extending up to middle of third segment of antennular peduncle. 1.60–3.35 mm in length. 0.50–0.75 × long as carapace. 15–28 (mostly 20–25) teeth on dorsal margin arranged up to tip or with short unarmed distal end. 1–5 post-orbital teeth. 0–10 (mostly 2–8) teeth on ventral margin to tip or with short distal unarmed end. Tip pointed. Formula (1–5) 15–28/0–10, mostly (3–4) 20–25/2–8.

Antennular peduncle ( Fig. 22e View Figure ): 0.7–0.8 × carapace. Stylocerite 0.6–0.7 × length of basal segment. Anterolateral teeth of basal segment 0.25–0.35 × second segment. 5–6 segments bearing aesthetascs.

First pereiopod ( Fig. 23a View Figure ): dactylus 1.1–1.4 × palm of propodus. Chela 2.8–3.2 × long as broad. Carpus 2.4–2.7 × long as broad, almost no anterior excavation, anterior end flat.

Second pereiopod ( Fig. 23b View Figure ): dactylus 1.1–1.3 × long as palm of propodus. Chela 3.7–4.5 × long as broad. Carpus 5–6 × long as broad.

Third pereiopod ( Fig. 23c, d View Figure ): dactylus 4.2–4.6 × long as broad. Spines on dactylus varied from 9–14 (including terminal spines), mostly 11–13. Propodus 2.5–3.5 × long as dactylus and 11–12 × long as broad with 10–15 spines arranged along posterior margin. Carpus 0.5–0.7 × long as propodus, with minute spines on inner margin. Merus 1.5–1.8 × carpus length. Merus with 5 spines on posterior margin.

Fifth pereiopod ( Fig. 23e, f View Figure ): dactylus 4.5–5.9 × long as broad with 30–40 spines arranged in comb-like fashion on inner margin. Propodus 12–14 × long as broad and 2.5–3 × long as dactylus with 7–14 spines arranged along inner margin. Carpus 0.4–0.6 × propodus length and with minute spines along inner margin. Merus 1.4–1.7 × carpus length, with 2 spines at posterior margin.

Setobranchs: 2 on all pereiopods.

First male pleopod ( Fig. 23g, h View Figure ): endopod 0.3–0.4 × exopod length. Appendix interna absent. Short stalked setae arranged uniformly along entire margin.

First female pleopod ( Fig. 23i View Figure ): endopod 0.5–0.7 × long as exopod.

Eggs ( Fig. 23j View Figure ): 15–20, 1.2–1.3 × 0.7–0.9 mm in size.

Second male pleopod ( Fig. 23k, l, m, n View Figure ): length of appendix masculina varying. 1.0–1.1 × appendix interna, in specimens from Angola. In specimens from Lake Tanganyika, ( Fig. 22m View Figure ) longer, 1.5–1.6 × appendix interna, 0.2–0.33 × endopod.

Sixth abdominal somite: 0.6–0.7 × long as carapace.

Telson ( Fig. 22o, p View Figure ): 1.0 to 1.1 × long as sixth abdominal somite. 3 or 4 pairs of dorsal spines (including subterminal spine). 1 pair of plain lateral spines and 3 or 4 pairs of stalked plumose process present at posterior margin.

Uropod ( Fig. 23q, r View Figure ): 7–10 diaeresis spinules.

Preanal carina ( Fig. 23s View Figure ): unarmed.

Remarks. Caridina amnicolizambezi  sp. nov. has the following distinctive characters: a shorter rostrum always with a pointed tip, turned upwards or straight with a slight bulge subterminally giving a spindle shape appearance; 15–28, mostly 20–25 teeth on dorsal margin of the rostrum, mainly arranged to the tip, rarely with a short distal unarmed margin; 0–10 ventral teeth (mostly 2–8) arranged with or without a short unarmed distal margin; the chelae are slender on the first and second pereiopods; the carpus of the first pereiopod has a flat anterior margin with almost no excavation; the dactylus of third pereiopod has 9–14 spines (including the terminal spine) (usually 11–13) and that of the fifth has 30–40 spines.

Ovigerous females carry 15– 20 eggs, 1.2–1.3 × 0.7–0.9 mm in size. The appendix masculina is either short being 1.0–1.1 × the appendix interna, or 1.5–1.6 × appendix interna. All of these characters are unique to Caridina amnicolizambezi  sp. nov. It is similar to C. togoensis  in having 3 or 4 pairs of stalked plumose processes on the posterior margin of the telson.

Etymology. The name amnicolizambezi  is derived from the Latin meaning, native of the river, and refers to its capture in the Zambezi River and its tributaries.


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University of Nottingham