The Usumacinta sea catfish[2] (Potamarius usumacintae) is a species of catfish in the family Ariidae.

[3] It was described by Ricardo Betancur-Rodriguez and Philip W. Willink in 2007.

It is endemic to the Usumacinta River between Mexico and Guatemala.

It reaches a maximum standard length of 59.5 cm (23.4 in).

This Ariidae-related article is a stub.