This species has not been found since 1963 and is considered extinct.
Males are slightly larger than females reaching up to 3.4 cm in length.
Ref:
1965:
Oryzias madagascarieunsis Arnoult Redescribed and Assigned to the East African Fish Genus Pantanodon (Atheriniformes, Cyprinodontoidei)
BY DONN ERIC ROSEN