Phalloceros

{{Short description|Genus of fishes}}

{{Automatic_taxobox

| image = Gefleckter Kaudi Männchen.jpg

| image_caption = Dusky millions fish (P. caudimaculatus)

| taxon = Phalloceros

| authority = C. H. Eigenmann, 1907

| type_species = Girardinus caudimaculatus

| type_species_authority = Hensel, 1868{{Cof record|genid=5401|title=Phalloceros|access-date=10 November 2019}}

}}

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).{{cite journal | author1 = Paulo Henrique Franco Lucinda | author2 = Roberto E. Reis | year = 2005 | title = Systematics of the subfamily Poeciliinae Bonaparte (Cyprinodontiformes: Poeciliidae), with an emphasis on the tribe Cnesterodontini Hubbs | journal = Neotropical Ichthyology | volume = 3 | issue = 1| pages = 1–60 | doi = 10.1590/S1679-62252005000100001 | doi-access = free }} P. caudimaculatus has long been part of the aquarium industry and has been introduced to countries far from its native range.