Phalloptychus is a genus of poeciliids that are native to eastern and southern Brazil, northern Argentina, Paraguay and Uruguay.
Description The maximum length for a male is around 2.5cm, while for females it is around 3.5 to 4cm.
Species There are currently three recognized species in this genus. They are listed below: Phalloptychus eigenmanni (Henn, 1916) Phalloptychus iheringii (G. A. Boulenger, 1889) Phalloptychus januarius (R. F. Hensel, 1868)
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