Brevibora exilis, a new rasborin fish from Borneo (teleostei: Cyprinidae)

Abstract

Brevibora exilis, new species, is described from the Kahayan and Sebangau basins, Kalimantan Tengah, Borneo, Indonesia. It is distinguished from its congeners, B. cheeya and B. dorsiocellata, by 10 circumpeduncular scales (vs. 12), anterior outline of dorsal-fin blotch ranging from 2nd unbranched ray to first four or five branched rays with transparent inter-radial membrane between 1st and 2nd unbranched rays (vs. blotch extending from 1st unbranched ray and inter-radial membrane between 1st and 2nd unbranched rays not hyaline), and relatively more slender body (body depth 19.3-24.7 % SL, vs. 24.4-26.7). It is further distinguished from B. cheeya by the incomplete lateral line with fewer perforated scales (6-10 vs. 25-30), a shorter head, a smaller caudal peduncular depth, a shorter caudal peduncule, a smaller prepectoral length, and shorter dorsal fin. It is further distinguished from B. dorsiocellata by having more scales along the lateral-line row (28-31 vs. 25-27).