Potamarius nelsoni (Evermann & Goldsborough, 1902)

(fig. 84)

Conorhynchos nelsoni ^ZBK Evermann & Goldsborough, 1902: 140, fig. 1. Type locality: rio Usumacinta, Montecristo , Yucatán, Mexico. Holotype: USNM 50001. Paratypes: USNM 52963.

Distribution: Usumacinta River basin.

Countries: Mexico and Guatemala.

Habitat: Freshwater.

Maximum size: 390 mm TL.

Material examined: AMNH 25684 (2 al, 217-233 mm TL), Guatemala, Peten, rio de la Passion, Altos de los Sacrificios .