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", meaning narrow; "keras", horn, referring to the large, slender sickle-like hook on the gonopodial appendix.