64022 Potamarius usumacintae Betancur-R. & Willink, 2007 Ariidae Sea catfishes Ariinae Siluriformes Teleostei Usumacinta sea catfish Central America: endemic to the Río Usumacinta basin in Guatemala and Mexico. FMNH 109148 17 N 90 W 1999 Potamarius usumacintae ECO-SC 4282 16 N 90 W 2005 Potamarius usumacintae ECO-SC 4274 16 N 90 W 2005 Potamarius usumacintae