Phalloceros

Phalloceros
Dusky millions fish (P. caudimaculatus)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cyprinodontiformes
Family:	Poeciliidae
Subfamily:	Poeciliinae
Genus:	Phalloceros C. H. Eigenmann, 1907

Phalloceros is a genus of poeciliids native to freshwater habitats in Brazil, Paraguay, Uruguay and northern Argentina. The majority are endemic to southern and southeastern Brazil (only exceptions are P. caudimaculatus, P. harpagos and P. leticiae).P. caudimaculatus has long been part of the aquarium industry and has been introduced to countries far from its native range.

There are currently 22 recognized species in this genus:

...
Wikipedia