4a. Dorsal fin short, its height 50 to 70% of head length; eye small, its diameter 5 or more
times in head length . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Paraplotosus albilabris
4b. Dorsal-fin height 75 to 100% of head length; eye larger, its diameter 4 times or less in
head length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paraplotosusmuelleri
(northern Australia, from Dampier Archipelago to the Gulf of Carpentaria)