Caridina evae , 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: 28-32
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Caridina evae sp. nov.
aterial examined. Holotype: ♂ Nigeria, Chubra division, S. Nigeria, pres. I. Sanderson, NHMAbout NHM 1922.214.171.124. Paratypes: Sierra Leone coll. & pres. Dr. D. J. Lewis, NHMAbout NHM 19126.96.36.199–6, 1) Farangbaia, 29.11.55, 1♀ ovig., 2) Farangbaia, 14.12.1955, 1♀ ovig, 3) Sahesachala, 28.10.55, 3♂. Liberia Gwinney Creek, Tchien near border with Ivory Coast, ca. 100 miles inshore, 5.2.1967, small, shallow, slow flowing stream with lots of leaf litter, Chura leg. T. C. Rutherford, RMNHAbout RMNH D 24468, 1♂. Nigeria 23.6.33, pres. I. Sanderson, NHMAbout NHM 19188.8.131.52–52, 6♂, 2♀ ovig., 1♀; Cameroon 27.3.33, No 155 in Bashor II Mamfe Div. Cameroons, 650 feet, pres. I. Sanderson, NHMAbout NHM 19184.108.40.206–44, 1♂, 1♀ ovig., 4♀; Mamfe Div. Cameroons 9.5.35, No 272 in Mainyu Bridge marfioeo, Cameroon, 500–600 feet, pres. I. Sanderson, NHMAbout NHM 19220.127.116.11–46, 1♂, 1♀; Black waters, coll. (27) 3.12.68, R. H. L. Disney, NHMAbout NHM 1974.696, 1♂, 1♀ ovig., 2♀; Black waters, 7.1.69, coll. R. H. L. Disney, NHMAbout NHM 1974.697, 1♀; Menge River, (186), coll. R. H. L. Disney, 8.3.69, NHMAbout NHM 1974.698, 1♂, 1♀; Okia stream, coll. R. H. L. Disney, 14.11.68, NHMAbout NHM 1974.699, 12♂, 5♀ ovig., 23♀; Kobe let, coll. R. H. L. Disney, 6.11.70, NHMAbout NHM 1974.700, 1♀; Ikilinindli, coll. R. H. L. Disney, 7.11.70, NHMAbout NHM 1974.701, 2♂, 1♀ ovig.; Black waters, 2.12.69, coll. R. H. L. Disney, NHMAbout NHM 1974. 702, 11♂, 6♀ ovig., 19♀; Mongusu Stream, coll. R. H. L. Disney, 14.11.68, NHMAbout NHM 1974.703, 6♂, 3♀; Okia, coll. R. H. L. Disney, 10.11.70, NHMAbout NHM 1974.704, 4♂, 2♀ ovig., 2♀; Kobe river Etam, coll. R. H. L. Disney, NHMAbout NHM 1974.705, 2♀ ovig. Gabon Keri, Gabon, W. Africa, Forest stream 20 km North of Lambarene, 15.11.1984, NHMAbout NHM 2007.724–729, 4♀.
Description. Total length: 14–25 mm. Carapace length: 4–5 mm.
Rostrum ( Fig. 11 View Figure a-e): short, straight, shorter or equal to, or slightly longer than antennular peduncle. 5– 2.9 mm in length. 0.30 to 0.65 × carapace. 3–12 (mostly 6–12) teeth on dorsal margin leaving 0.4–0.75 of length distally unarmed. 3–6 (mostly 3–5) post-orbital teeth. 1–5 teeth arranged on distal ventral margin below dorsal unarmed margin to tip or with short distal end unarmed. Tip pointed. Formula (3–6) 3–12/1–5 mostly (3–5) 6–12/2–5.
Antennular peduncle ( Fig. 11f View Figure ): antennular peduncle 0.7 × carapace. Basal segment of antennular peduncle with long stylocerite reaching 0.9–1.1 × basal segment. Anterolateral teeth of basal segment short being 0.08–0.15 × second segment. Aesthatasc bearing segments 6–10.
First pereiopod ( Fig. 12a View Figure ): dactylus 0.9–1.3 × palm of propodus. Chela, 2.0–2.3 × long as broad. Carpus slender 1.8–2.1 × long as broad. Carpus with deep excavation anteriorly.
Second pereiopod ( Fig. 12b View Figure ): Long and slender. Dactylus 1.1–1.3 × long as palm of propodus. Chela 2.9–3.2 × long as broad. Slender carpus 4.5–5.5 × long as broad.
Bristle-like setae arranged at tip of chelae of first and second pereiopods.
Third pereiopod ( Fig. 12c, d View Figure ): dactylus 2.25–2.6 × long as broad with 5 to 7 spines (including terminal spine). Propodus 3.8 to 4.5 × long as dactylus and 8–10 × long as broad with 9–15 small spines arranged along posterior margin. Carpus 0.6–0.8 × propodus and with small spines on inner margin, merus with 4–5 big spines on posterior margin and 1.6 to 1.7 × carpus.
Fifth pereiopod ( Fig. 12e, f View Figure ): dactylus 3.0–4.2 × long as broad with 65–80 spines arranged in comb-like fashion on posterior margin. Propodus 3.0–3.5 × long as dactylus and 10–11 × long as broad. Carpus 0.5–0.7 × propodus with small spines on posterior margin. Merus 1.4–1.6 × carpus and with 3 large spines on posterior margin.
Setobranchs: 3 on all pereiopods.
First male pleopod ( Fig. 12g, h View Figure ): endopod 0.6–0.8 × exopod, with short appendix interna. Endopod with closely arranged long stalked setae on outer margin and with shorter setae on inner margin.
First female pleopod ( Fig. 12i, j View Figure ): almost equal in length to exopod 0.8–1.00 × exopod.
Eggs ( Fig. 12k View Figure ): 20–25, 1.1–1.3 × 0.6–0.75 mm in size.
Second male pleopod ( Fig. 13a, b View Figure ): Appendix masculina 1.9–2 × appendix interna and 0.37–0.45 × exopod.
Sixth abdominal segment: 0.35–0.6 × long as carapace.
Telson ( Fig. 13c, d View Figure ): 1–1.25 × long as sixth segment, broad and robust. Fine setae present on telson, 5–7 pairs of dorsal spines (including subterminal spines) arranged in curved fashion.1 plain lateral spine and 4 or 5 pairs of long densely plumose stalked processes present on rounded posterior margin. Short, fine setae attached to posterior margin between plumose processes.
Uropod ( Fig. 13e, f View Figure ): 17–21 diaeresis spinules.
Preanal carina ( Fig. 13g View Figure ): shaped like protruding peg without spines and adorned with long setae.
Remarks. Caridina evae sp. nov. is distinct by virture of having fewer teeth on the dorsal margin of the rostrum arranged at the proximal end leaving the distal dorsal margin unarmed and with 3 or 4 post-orbital teeth. The teeth on the ventral margin are always arranged at the distal end beginning from the point where the dorsal teeth end. The rostral formula is (3–6) 3–12/1–5, mostly (3–5) 6–12/2–5. The tip of the rostrum is always pointed. The stylocerite is long, reaching 0.9–1.1 of the first segment of the antennular segment. The anterolateral tooth is shorter, reaching 0.08–0.15 × the second segment. The endopods of the first pleopods of male longer with a shorter appendix interna and the endopod of the first pleopod of female is longer. The appendix masculina is longer. There are 20–25 larger eggs. The telson is broad. There are 17–21 spinules on the uropod diaeresis and the preanal carina is peg-like and without spines. All these characters make C. evae sp. nov. distinct from C. africana and C. togoensis . However, in possessing the long, stalked, plumose processes on the posterior margin of the telson, C. evae sp. nov. is similar to C. togoensis .
Etymology. Caridina evae is named for Dr.Eva Roth-Woltereck, in appreciation of her contributions to the study of Crustacea, especially the atyid fauna of Africa.
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