Phalloceros lucenorum, the Jaquiá toothcarp, is a species of poeciliid fish native to Brazil.
Phalloceros lucenorum is found in Brazil in the Rio Juquiá, which is a tributary to the drainage of the rio Ribeira de Iguape in São Paulo, Brazil.
The females of this species grow to a total length of , while males remain smaller at . .
The fish live in tropical freshwater; and are benthopelagic.
The fish is named in Latin = elachis, small, or short or little; âÂÂistos, meaning least, referring to small size.