Ptychocharax rhyacophila Weitzman, Fink, Machado-Allison & Royero L. 1994

Inhabits clear streams with sand and granitic rocks bottoms covered by dense mats of the plant Apinaga multibranchiata (Podostemaceae) in areas of fast water. Feeds on larvae of aquatic insects such as simulids and trichopterans that were found among the podostemacean plants. A few ants and spiders were also found in the stomachs.

Inhabits clear streams with sand and granitic rocks bottoms covered by dense mats of the plant Apinaga multibranchiata (Podostemaceae) in areas of fast water. Feeds on larvae of aquatic insects such as simuliids and trichopterans that were found among the podostemacean plants. A few ants and spiders were also found in the stomachs.

Ptychocharax rhyacophila is a species of characin endemic to Venezuela, where it is found in the upper Siapa River. This species is the only member of the genus Ptychocharax.