Abstract
On the basis of external morphology and anatomy, 17 scpeies of the genus Silurus Linnaeus including a new species, S. torrentis from Thailand and Burma, are recognized as valid. S. bedfordi Regan is synonymized with S. asotus, and S. goae Haig is transferred to the genus Ompok. From an anatomical study of 12 species, the diagnostic feature of the genus Parasilurus Bleeker is revealed to be invalid, and the genus is synonymized with Silurus. From the phylogenetic analysis, the genus Silurus is divided into two major species groups, the cochinchinensis group which is distributed mainly in Southeast Asia, and the glanis group which is further separated into three subgroups occurring separately in East Asia and Europe. The pattern of distribution and relationships between ontogeny and phylogeny in the genus Silurus are briefly discussed.
