Caridina ebuneus , 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: 39-42

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Caridina ebuneus

sp. nov.

Caridina ebuneus  sp. nov.

( Figs. 18 View Figure , 19 View Figure )

Material examined. Holotype: ♀ ovig. Ivory Coast Vicinity Abengourou; 2.1949, coll. B. Holas, pres. Inst. Franç. Afr. Noire., RMNHAbout RMNH D 19459. Paratypes: ORSTOMAbout ORSTOM, sta. KAN, det. Corredor, MNHNAbout MNHN Na 6161, 11♂, 1♀ ovig., 5♀; 3.1949, coll. B. Holas, pres. Inst. Franç. Afr. Noire., RMNHAbout RMNH D 19459, 7♂, 3♀ ovig., 2♀; Gagnoa, 6°04'N 5°55'W, 1954, coll. E. Binder, pres. Mus. Hist. Nat. Genève. RMNHAbout RMNH D 11694, 2F; Yapo near Agboville, 10.1946, coll. M. De Keyser, pres. Inst. Franç Afr. Noire, RMNHAbout RMNH D 19460, 1♂, 2♀ ovig.

Description. Total length: 20–35 mm. Carapace length: 3.5–4 mm.

Rostrum ( Fig. 18a, b, c View Figure ): slightly longer than antennular peduncle or equal to antennal scale, rarely shorter than peduncle. 3–4 mm in length. 0.7–0.9 × long as carapace. 16–24 (mostly 16–20), teeth on dorsal margin leaving 0.3–0.4 of length distally unarmed, unarmed margin occasionally interrupted by 1–2 teeth. 1–3 (usually 2–3) post-orbital teeth. 5–16 (mostly 8–13) teeth on ventral arranged from proximal end almost to tip. Tip bifid or acute. Formula (1–3) 16–24/5–16 mostly (2–3) 16–20/8–13.

Antennular peduncle ( Fig. 18d View Figure ): 0.6–0.7 × carapace. Stylocerite 0.7–0.9 × length of basal segment. Anterolateral teeth of basal segment 0.2–0.3 × second segment. 5–7 segments bearing aesthetascs.

First pereiopod ( Fig. 19a View Figure ): dactylus 1–1.3 × palm of propodus. Chela 2.1–2.5 × long as broad. Carpus 2–2.5 × long as broad, anterior excavation deep.

Second pereiopod ( Fig. 19b View Figure ): dactylus1.1–1.3 × long as palm of propodus. Chela 2–2.5 × long as broad. Carpus 4–5 × long as broad.

Third pereiopod ( Fig. 19c, d View Figure ): dactylus 3–3.5 × long as broad. Spines on dactylus varying from 8–12 (including terminal spines), mostly 9–10. Propodus 3.5–4 × long as dactylus and 11–12 × long as broad with 8–12 spines arranged along posterior margin. Carpus 0.55–0.7 × long as propodus, with minute spines on inner margin. Merus 1.9–2.3 × carpus length. Merus with 3 large spines and several fine setae on posterior margin.

Fifth pereiopod ( Fig. 19e, f View Figure ): dactylus 5.5–6.5 × long as broad with 60–70 spines arranged in comb-like fashion on inner margin. Propodus 13.0–14.5 × long as broad and 2.5–3.0 × long as dactylus with 10–15 spines arranged along inner margin. Carpus 0.45–0.60 × propodus length and with minute spines along inner margin. Merus 1.4–1.7 × carpus length, with 1 spine at posterior margin.

Setobranchs: 2 on all pereiopods.

First male pleopod ( Fig. 19g, h View Figure ): endopod 0.3–0.4 × exopod length. Appendix interna absent.

First female pleopod ( Fig. 19i View Figure ): endopod 0.35–0.45 × long as exopod.

Eggs ( Fig. 19j View Figure ): 55–60, 0.75–0.9 × 0.4–0.5 mm in size.

Second male pleopod ( Fig. 19k, l View Figure ): appendix masculina 1–1.2 × appendix interna. 0.2–0.25 × endopod.

Sixth abdominal somite: 0.70–0.75 × long as carapace.

Telson ( Fig. 19m, n View Figure ): 1.0–1.1 × long as sixth abdominal somite. Dorsal spines 3 or 4 pairs (including subterminal spine). 1 pair of plain, short lateral spines and 3 or 4 pairs of stalked plumose process present on posterior margin.

Uropod ( Fig. 19o, p View Figure ): 6–10 (mostly 7–8) diaeresis spinules.

Preanal carina ( Fig.19q View Figure ): with spine.

Remarks. Caridina ebuneus  sp. nov. is similar to C. africana  in the arrangement of teeth on the rostrum, arranged from the proximal end of the dorsal margin leaving the distal margin unarmed, with the teeth on the ventral margin of the rostrum arranged from the proximal end of the ventral margin almost to the tip, and with the tip of the rostrum being bifid or pointed. It is different from C. africana  in possessing fewer uropod diaeresis spinules and in possessing long plumose processes on the posterior margin of the telson. Caridina ebuneus  sp. nov. is similar to C. togoensis  in possessing stalked plumose processes on the posterior margin of the telson. However, C. ebuneus  differs distinctly from C. togoensis  in the arrangement of teeth on the rostrum (with a dorsal distal unarmed margin) with a bifid or pointed tip, teeth on ventral margin of the rostrum always arranged up to the tip, in possessing shorter appendix masculina and in having 50– 60 eggs of comparatively smaller size (0.7–0.9 × 0–0.4– 0.5mm).

Caridina ebuneus  sp. nov. is similar to C. ghanensis  in possessing a relatively short appendix masculina. However, the appendix masculina is slightly longer than the appendix interna in C. ebuneus  sp. nov. while in C. ghanensis  , the appendix masculina may be shorter to slightly longer than the appendix interna. Caridina ebuneus  sp. nov. differs C. ghanensis  in having 5–16 teeth arranged from the proximal end to tip on the ventral margin of rostrum and having 55– 60 eggs.

Etymology. The name, ebuneus  , is derived from the Latin for ivory, alluding to the Ivory Coast, where all the material was collected.


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