Caudal fin rays 10. Juveniles bright yellow with black spots; the spots decrease proportionately and the bright yellow becomes a dirty mustard with growth; large adults become bluish with yellowish seams between the plates.

Description: Characterized further by adults having numerous black spots on fins; juvenile with scattered black spots on head and body; carapace quadrangular in cross section, concave sides, broader at base than dorsally; more or less straight dorsal profile of snout, presence of bony protuberance above upper lip (absent in juvenile); rounded caudal fin (Ref. 90102).