The Usumacinta sea catfishCommon names of Potamarius usumacintae at www.fishbase.org. (Potamarius usumacintae) is a species of catfish in the family Ariidae. It was described by Ricardo Betancur-Rodríguez and Philip W. Willink in 2007. It is endemic to the Usumacinta River between Mexico and Guatemala. It reaches a maximum standard length of .
Etymology The species epithet "usumacintae" refers to the Usumacinta River.
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