See text Anablepidae is a family of ray-finned fishes which live in brackish and freshwater habitats from southern Mexico to southern South America.

[2] There are three genera with sixteen species: the four-eyed fishes (genus Anableps), the onesided livebearers (genus Jenynsia) and the white-eye, Oxyzygonectes dovii.

Fish of this family eat mostly insects and other invertebrates.

They mate on one side only, right-"handed" males with left-"handed" females and vice versa.

[3] The male has specialized anal rays which are greatly elongated and fused into a tube called a gonopodium associated with the sperm duct which he uses as an intromittent organ to deliver sperm to the female.