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

Apionichthys rosai is a species of sole in the family Achiridae. It was described by Robson Tamar da Costa Ramos in 2003. It is found in the Amazon River. It reaches a maximum standard length of 3.5 cm (1.4 in).

The species epithet "rosai" was given in honour of Ricardo de Sousa Rosa, a marine scientist at the Federal University of Paraíba in Brazil.