Fish in the subfamily Oxyzygonectinae are ovoviviparous. The Anablepinae are livebearers. 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.
Subfamilies and genera
The family is divided into two subfamilies and three genera:[4][5][1]
^Nelson, Joseph, S. (2006). Fishes of the World. John Wiley & Sons, Inc. ISBN0-471-25031-7.{{cite book}}: CS1 maint: multiple names: authors list (link)