Platystomatichthys sturio is the only species in the genus Platystomatichthys of the catfish (order Siluriformes) family Pimelodidae. It is sometimes called the sturgeon catfish.[1] This species occurs in the Amazon Basin and reaches a length of about 40cm (20inches) TL. Platystomatichthys is classified under the "Calophysus-Pimelodus clade". Within this clade, it is considered a part of the "Pimelodus-group" of Pimelodids, which also includes Pimelodus, Exallodontus, Duopalatinus, Cheirocerus, Iheringichthys, Bergiaria, Bagropsis, Parapimelodus, Platysilurus, and Propimelodus.[2]
. Exotic Tropical Fishes. Herbert R. Axelrod. Emmens, C. . Burgess, W. . Pronek, N. . T.F.H. Publications. 1996. 0-87666-543-1.