Silurichthys ligneolus, a new catfish (Teleostei: Siluridae) from southern Borneo, Indonesia

Abstract

Silurichthys ligneolus, a new species of silurid catfish, is described from blackwater habitats in southern Borneo. The new species can be distinguished from congeners in having a combination of: body depth at anus 9.1-11.0% SL, caudal peduncle depth 4.7-5.5% SL, eye diameter 6.7-9.8% HL, pelvic fins present, 44-45 anal-fin rays, 3-4 principal rays on the lower caudal-fin lobe, lower lobe of caudal fin indistinct, 46-48 vertebrae, one gill raker on the first branchial arch, and body uniformly brown. Based on the morphology of its caudal fin, S. ligneolus is hypothesized to be the sister taxon of S. sanguineus. Copyright © 2011.