Apionichthys rosai Ramos 2003

Lacks a gill opening on the eyed side; having 2 or 3 series of scales with rounded posterior margin and larger than other trunk scales along dorsal, anal and pelvic fin bases on the eyed side. Similar to Apionichthys asphyxiatus in the absence of a gill opening on the eyed side, but differs in its larger interorbital space that is 2 to 4 times the orbital diameter (vs. interorbital space half the orbital diameter).

Dorsal soft rays (total): 44 - 56; Analsoft rays: 46 - 49; Vertebrae: 35 - 36