Phalloceros uaiPhalloceros uai, the one spot toothcarp, is a species of poeciliid fish native to Brazil.DistributionPhalloceros uai is found in the Rio das Velhas, in the Rio São Francisco basin in Brazil.SizeThe females of this species grow to a total length of, while males remain smaller at.HabitatThe fish live in tropical freshwater; and are benthopelagic.EtymologyThe fish is an interjection usually served to express surprise, which is used by the natives of Minas Gerais, Brazil incidentally where this species occurs, as an homage to the author's birthplace, Minas Gerais,