Record of the flathead fishes (Perciformes: Platycephalidae) collected from Nha Trang, Vietnam

The platycephalids collected from Nha Trang, Vietnam were studied taxonomically to record seven species, Elates ransonnetii (Steindachner 1876), Inegocia japonica (Tilesius 1812), Onigocia macrolepis (Bleeker 1854), Platycephalus cultellatus Richardson 1846, Rogadius asper (Cuvier 1829), R. serratus (Cuvier 1829) and R. tuberculatus (Cuvier 1829). Elates ransonnetii and R. serratus are newly recorded from Nha Trang. Platycephalus cultellatus and R. asper have been confused with P. indicus (Linnaeus 1758) and R. pristiger (Cuvier 1829) respectively by many authors and the specimens of P. cultellatus and R. asper represent the reliable first record of these species from Nha Trang. The key characters separating R. asper and R. pristiger are given for the first time. Although the maximum total length of R. tuberculatus was reported to be ca. 14cm, our largest specimen of the species attains ca.18cm