Phalloceros leptokeras, the Sapucaia toothcarp, is a species of poeciliid fish native to Brazil.
Distribution Phalloceros leptokeras is found in Brazil in the middle portions of rio Paraíba do Sul drainage.
Size The females of this species grow to a total length of , while males remain smaller at .
Habitat The fish live in tropical freshwater, and are pelagic.
Etymology The fish is named in Latin; leptos means "narrow", and keras, "horn", refers to the large, slender sickle-like hook on the gonopodial appendix.
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