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Anablepidae
Anablepidae is a family of ray-finned fishes which live in brackish and freshwater habitats from southern Mexico to southern South America. 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. Reproduction 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. 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 An intromittent organ is any external organ of a male organism that is specialized to deliver sperm during copulation. Intromittent organs are found most often in terrestrial species, as most non-mammalian aquatic species fertiliz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onesided Livebearer
''Jenynsia'' is a genus of fresh water, freshwater fishes in the family (biology), family Anablepidae. Like ''Anableps'' species, they are onesided livebearers: some sources indicate that they only mate on one side, right-"handed" males with left-"handed" females and vice versa. However, other sources dispute this. These South American fish are viviparity, viviparous. Distribution Species of the genus are distributed in the Río de la Plata Basin and Atlantic coastal drainages from Río Negro Province, Argentina, to the city of Rio de Janeiro, Brazil, and in the Andes, Andean drainages of northwest Argentina and southern Bolivia. Taxonomy ''Jenynsia'' is the cladistics, sister group to the genus ''Anableps'' and both are classified in the subfamily Anablepinae; together with the genus ''Oxyzygonectes'' they compose the family Anablepidae. ''Jenynsia'' contains two subgenera. Members of the subgenus ''Plesiojenynsia'' Ghedotti, 1998, are distributed in the uplands of southern Bra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |