Phalloceros lucenorum, the Jaquiá toothcarp, is a species of poeciliid fish native to Brazil.
Distribution.
"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.
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 benthopelagic. 
Etymology.
The fish is named in Latin = "elachis", small, or short or little; "–istos", meaning least, referring to small size.