Caridina umtatensis , 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: 63-66

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Caridina umtatensis

sp. nov.

Caridina umtatensis  sp. nov.

( Figs. 34 View Figure , 35 View Figure )

Material examined. Holotype: ♀ South Africa Kraal Dam, Umtata, coll. A. Pretorius, 16.2.1995, SAMAbout SAM A 45518. Paratypes: Kraal Dam, Umtata, coll. A. Pretorius, 16.2.1995, coll. W. Emmerson, SAMAbout SAM A 45518, 24♂, 19♀ ovig. 5♀, 1 juv.; Mquanduli 31°54'40"S, 28°51'14"E from a slow stream, SAMAbout SAM A 13391, 8♂, 1♀ ovig., 2♀; Lateba, Crocodile River, SAMAbout SAM A 10669, 2♀.

Description. Total length: 24–34 mm. Carapace length: 4–5 mm.

Rostrum ( Fig. 34a, b, c, d View Figure ): upturned or straight mostly equal to antennal scale or shorter equal to antennular peduncle, or fractionally longer than antennal scale. 3.8–5 mm in length. 0.9–1 × long as carapace. 7–18 teeth on dorsal margin arranged leaving 0.5–0.75 of length unarmed, rarely 1-2 teeth on unarmed margin. 1–4 post-orbital teeth. 4–16 teeth on ventral margin arranged from proximal end to tip or with unarmed distal margin. Tip bifid or acute. Formula (1–4) 7–18/4–16.

Antennular peduncle ( Fig. 34e View Figure ): 0.75–0.85 × carapace. Stylocerite 0.7–0.9 × length of basal segment. Anterolateral teeth of basal segment 0.25–0.3 × second segment. 10–18 segments bearing aesthetascs.

First pereiopod ( Fig. 35a View Figure ): dactylus 1.1–1.3 × palm of propodus. Chela 2.5–2.7 × long as broad. Carpus 2–2.3 × long as broad, with excavation anteriorly.

Second pereiopod ( Fig. 35b View Figure ): dactylus 1.2–1.4 × long as palm of propodus. Chela 2.4–2.7 × long as broad. Carpus 4.2–4.7 × long as broad.

Third pereiopod ( Fig. 35c, d View Figure ): dactylus 3–3.2 × long as broad. Spines on dactylus varying from 10–13 (including terminal spines). Propodus 4.1–4.5 × long as dactylus and 10–11 × long as broad with 12–17 spines along inner margin. Carpus 0.6–0.7 × long as propodus, with 1 large spine and 4–5 small spines on inner margin. Merus 1.6–1.8 × carpus length. Merus with 3 large spines along posterior margin.

Fifth pereiopod ( Fig. 35e, f View Figure ): dactylus 3.5–3.8 × long as broad with 60–75 spines arranged in comb-like fashion on inner margin. Propodus 13–14 × long as broad and 4–4.5 × long as dactylus with 11–17 spines along posterior margin. Carpus 0.5–0.7 × propodus length and with 1 large spine and 4–6 minute spines along inner margin. Merus 1.5–1.7 × carpus length, with 2 large spines along posterior margin.

Setobranchs: 5 on all pereiopods.

First male pleopod ( Fig. 35g, h View Figure ): endopod 0.25–0.35 × exopod length. Appendix interna present. Long setae present on anterior margin of endopod bend across appendix interna thus folding tip of endopod. Series of stalked processes present around entire margin.

First female pleopod ( Fig. 35i View Figure ): endopod 0.55–0.7 × long as exopod.

Eggs ( Fig. 35j View Figure ) 55–70, 1.07–1.1 × 0.64–0.7mm in size.

Second pleopod of male ( Fig. 35k, l View Figure ): appendix masculine 1.5–1.7 × appendix interna.and 0.3–0.4 × endopod. Several stalked spines present along tip and posterior margin.

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

Telso n ( Fig. 35m, n View Figure ): 1–1.1 × long as sixth abdominal somite. 5–8 pairs of dorsal spines (mostly 5–7) present (including subterminal spines). Pair of extra subterminal spines or only 1 extra subterminal spine on one side, present or not. Posterior margin triangular mostly ending in medial pointed process, rarely plain without median pointed process, with 1 pair of lateral spines and 1–3 pairs, mostly 2 or 3 pairs of inner spines of equal length.

Uropod ( Fig. 35o View Figure ): 10–15 diaeresis spinules.

Preanal carina ( Fig. 35p View Figure ): unarmed.

Remarks. Caridina umtatensis  sp. nov. is distinguished by 7–18 teeth on the dorsal margin of the rostrum arranged mostly restricted up to the point of curvature of the proximal end of the ventral margin. The unarmed section of the dorsal rostral margin is occasionally interrupted by one tooth. The 4–16 teeth on the ventral rostral margin are always arranged uniformly from the proximal end to tip ( Fig. 34c View Figure ) or leaving shorter ( Fig. 34b View Figure ) or longer ( Fig. 34 d View Figure ) ventral distal margin unarmed. The rostral formula is (1–4) 7–18/4–16. The posterior margin of the telson is usually triangular with a median pointed process rarely plain and 1–3 inner spines of equal length to the lateral spines. Caridina umtatensis  sp. nov. is distinctly different from C. africana  . and C. togoensis  by in arrangement of teeth on the rostrum.

Etymology. Named umtatensis  , after the river in which the species was found.


South African Museum