Caridina belazoniensis , 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: 33-35
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Caridina belazoniensis sp. nov.
Material examined. Holotype: ♀ ovig. Kenya Mbelazoni, Lower Athi River, Sabaki Estuary, coll. & pres. Hugh Copley, 1954, NHMAbout NHM 2007. 723. Paratypes: Kenya Belazoni, Pres. Hugh Copley, NHMAbout NHM 1955.1 24.22–26, 4♂, 14♀ ovig., 4♀; Mbelazoni, Lower Athi River, Sabaki Estuary, coll. & pres. Hugh Copley, 1954, NHMAbout NHM 2007.702–711, 1♂, 26♀ ovig., 4♀. South Africa Kwazulu Natal, Usutu River, Dirt Road, Near bridge, Usutu River System, Matata, 26° 51' 22"S, 31° 54' 31"E, R. Bills, 31.3.2003, AM GEN 1758 A, 1♂, 2♀ ovig.
Description. Total length: 25–38 mm. Carapace length: 4.5–6 mm.
Rostrum ( Fig. 14a, b, c View Figure ): always longer than antennal scale. 4.5–7.5 mm in length. 1–1.2 × long as carapace. 5–20 (mostly 12–15) teeth on dorsal margin leaving 0.5–0.55 of length distally unarmed. No post-orbital teeth. 14–25 (mostly 17–21) teeth on ventral margin leaving short distal end unarmed. Tip usually bifid, rarely pointed. Formula (0) 5–20/14–25, mostly (0) 12–15/17–21.
Antennular peduncle ( Fig. 14d View Figure ): 0.6–0.75 × carapace. Stylocerite 0.6–0.8 × length of basal segment. Anterolateral teeth of basal segment 0.2–0.3 × second segment. 12–15 segments bearing aesthetascs.
First pereiopod ( Fig. 15a View Figure ): dactylus 1.5–1.9 × palm of propodus. Chela 2.5–2.9 × long as broad. Carpus 2–2.4 × long as broad, anterior excavation deep.
Second pereiopod ( Fig. 15b View Figure ): dactylus 1.5–2.2 × long as palm of propodus. Chela 3.0–3.5 × long as broad; Carpus 3–4 × long as broad.
Third pereiopod ( Fig. 15c, d View Figure ): dactylus 2.3–2.9 × long as broad. Spines on dactylus varied from 6–9 (including terminal spines), mostly 7 or 8. Propodus 4.0–5.5 × long as dactylus and 9.5 or 10.5 × long as broad with 20–22 spines arranged along inner margin. Carpus 0.6–0.7 × long as propodus, with minute spines on inner margin. Merus 1.7–2.0 × carpus length. Merus with 2 large spines on the posterior margin.
Fifth pereiopod ( Fig. 15e, f View Figure ): dactylus 3.0–3.5 × long as broad with 35–45 spines arranged in comb-like fashion on inner margin. Propodus 13.0–14.5 × long as broad and 4.0–5.3 × long as dactylus with 15–20 spines arranged along inner margin. Carpus 0.5–0.6 × propodus length and with minute spines along inner margin. Merus 1.5–1.8 × carpus length, with 1 large spine on posterior margin.
Setobranchs: 2 on all pereiopods.
First male pleopod ( Fig. 15g, h View Figure ): endopod 0.3–0.4 × exopod length. Appendix interna usually turned towards exopod.
First female pleopod ( Fig. 15i View Figure ): endopod 0.60–0.75 × long as exopod.
Eggs ( Fig. 15j View Figure ): 780–800, 0.35–0.4 × 0.20–0.25 mm in size.
Second pleopod of male ( Fig. 15k, l View Figure ): appendix masculina 1.5–1.9 × appendix interna, 0.30–0.35 × endopod.
Sixth abdominal somite: 0.5–0.6 × long as carapace.
Telson ( Fig. 15m, n View Figure ): tapering uniformly to blunt posterior margin protruding beyond single pair of plain stout lateral spines. 1.0–1.3 × long as sixth abdominal segment. Dorsal spines 4–6 pairs (including sub terminal spine). 2 or 3 pairs of fine setae may be present on protruding peg-like tip of telson.
Uropod ( Fig. 15o, p View Figure ): 7–14 (mostly 9–11) diaeresis spinules.
Preanal carina ( Fig. 15q View Figure ): sharp with spine.
Remarks. Caridina belazoniensis sp. nov. is distinguished by the large sized adults with a longer rostrum that always overreaches the antennal scale, absence of the post-orbital teeth, dorsal distal margin of rostrum unarmed and the tip of the rostrum mostly bifid (rarely pointed). The spines on the posterior margin of the telson are limited to a single pair of lateral spines and the posterior margin of the telson protrudes beyond the lateral spines. Females have 780– 800 eggs of 0.35–0.40 × 0.20–0.25 mm size. These characters distinguish C. belazoniensis sp. nov. from C. africana Kingsley (1882) and C. togoensis Hilgendorf (1893)
Etymolgy. Caridina belazoniensis sp. nov. is named after the Belazoni Canal, Kenya, the type locality.
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