Phalloceros alessandrae, or Alessandra's toothcarp, is a species of poeciliid fish native to Brazil.
Phalloceros alessandrae is found in Brazil in flooded areas on margins of nearby Antonina and rio Dois de Fevereiro, flowing into the BaÃÂa de Paranaguá.
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 honor of Lucinda's wife, Ms. Alessandra M. V. Lucinda.