Laubuka trevori

description

Description. See Table 1 for morphometric characters and meristics, and Figures 1 A and 2 for general appearance. Body slender, its depth about one-fifth standard length, laterally compressed, its dorsal profile slightly curved, ventral profile convex, keeled from origin of pelvic fin to anus. Dorsal fin with 2 simple and 7 ½ branched rays, its posterior margin slightly concave, its origin above base of fifth branched anal-fin ray. Pelvic fin with 1 unbranched and 5 branched rays, unbranched ray not extending beyond anus. Anal fin with 3 simple and 15 ½ (3) or 16 ½ (1) branched rays, its ventral margin deeply concave, with a sharp curve among the first few branched rays. Pectoral fin with 1 simple and 8 (2) or 9 (2) branched rays. Caudal fin deeply forked, its lobes subequal, with 1 + 9 + 8 + 1 principal rays. Anal-fin rays iii, 16 ½ iii, 15 ½ – 16 ½ iii, 18 ½ iii, 17 ½ – 18 ½ iii, 18 ½ – 20 ½ iii, 14 ½ – 15 ½ Caudal-fin principal rays 1 + 9 + 8 + 1 1 + 9 + 8 + 1 1 + 9 + 8 + 1 1 + 9 + 8 + 1 1 + 9 + 8 + 1 1 + 9 + 8 + 1 Predorsal scales 18 17 – 18 17 17 – 18 16 – 17 18 Head small, its dorsal profile almost straight, a slight indentation at nape. Eyes large, placed forward, their diam

Description of two new species of Laubuka (Teleostei: Cyprinidae) from River Cauvery, southern Iandia

diagnosis

Diagnosis. Laubuka trevori is distinguished from its Indian congeners as follows. From L. laubuca by possessing 7 ½ branched dorsal-fin rays (vs. 8 ½); 15 ½ – 16 ½ branched anal-fin rays (vs. 18 ½ – 20 ½); 8 – 9 branched pectoral-fin rays (vs. 11 – 12); 1 ½ scales between lateral line and pelvic-fin origin (vs. 2 ½); a lesser preanal length (61.1 – 62.3 % SL, vs. 64.4 – 69.1 % SL); a longer (13.9 – 15.2 % SL, vs. 11.9 – 13.1 % SL) and slenderer caudal peduncle (6.4 – 7.3 % SL, vs. 9.3 – 10.6 % SL); a lesser body depth (18.8 – 20.1 % SL, vs. 27.4 – 32.6 % SL) and a shorter dorsalfin base (10.0 – 11.1 % SL, vs. 13.2 – 16.9 % SL). Moreover, L. trevori, when compared to L. laubuca, has the articular surface of the supraorbital with the lateral ethmoid straight (vs. with a deep concavity) (Fig. 3 - 1, 22); third suborbital slender, with its anterior end much narrower than its posterior end (vs. third suborbital broad, with both ends almost the same width) (Fig. 3 - 2, 23); maxilla slender, with its ventral margin straight (vs. ventral margin curved) (Fig. 3 - 3, 24); dentary with the coronoid process blunt (vs. posteriorly pointed), its inferior border slightly convex (vs. straight) (Fi

Description of two new species of Laubuka (Teleostei: Cyprinidae) from River Cauvery, southern Iandia

distribution

Distribution. Laubuka trevori is at present known from the Cauvery River system at Coorg (Kodagu) in Karnataka, but probably occurs throughout a wider range in the Cauvery River and its tributaries.

Description of two new species of Laubuka (Teleostei: Cyprinidae) from River Cauvery, southern Iandia

etymology

Etymology. The species is named after Trevor Menezes (21.07.1957 – 10.12.2010), for his enthusiasm and support to aquarium-fish hobbyists in exploring the Cauvery and Tunga River systems; he died during one such expedition. The species name is formed as a noun in the masculine genitive singular.

Description of two new species of Laubuka (Teleostei: Cyprinidae) from River Cauvery, southern Iandia