Fauna of Argentina
Fauna of Bolivia
Fish of Argentina
Fauna of Argentina Forum
Jenynsia is a genus of freshwater fishes in the family Anablepidae. Like Anableps species, they are onesided livebearers: they only mate on one side, right-"handed" males with left-"handed" females and vice versa. These fish are viviparous.
Species of the genus are distributed in the La Plata River Basin and Atlantic coastal drainages from Rio Negro Province, Argentina, to the city of Rio de Janeiro, Brazil, and in the Andean drainages of northwest Argentina and southern Bolivia.
Jenynsia is the 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 Plesiojenysia Ghedotti, 1998, are distributed in the uplands of southern Brazil. Members of the subgenus Jenynsia are more widely distributed in southern South America, with one species, J. sanctaecatarinae also found in the uplands of southern Brazil. Members of the two subgenera are partially sympatric in southeastern Brazil.
Unlike their cousins Anableps, their eyes are normal. Jenynsia species are diagnosable by the possession of an unscaled tubular
gonopodium formed chiefly by the third, sixth, and seventh anal-fin rays and by the possession of tricuspid teeth in the outer mandibular series in adults. The maximum length in these species is up to 12 centimetres in females and about 4 cm in males.
Subgenera and species according to Ghedotti, 2001 and Lucinda et al., 2006.
Jenynsia maculata Regan, 1906
Rio de la Plata onesided livebearer, Jenynsia multidentata
Jenynsia onca Lucinda, Reis & Quevedo, 2002
Jenynsia pygogramma Boulenger, 1902
Jenynsia sanctaecatarinae Ghedotti & Weitzman, 1996
Jenynsia tucumana Aguilera & Mirande, 2005
Subgenus Plesiojenynsia Ghedotti, 1998
Jenynsia diphyes Lucinda, Ghedotti & Graca, 2006
Jenynsia eirmostigma Ghedotti & Weitzman, 1995
Jenynsia unitaenia Ghedotti & Weitzman, 1995
Jenynsia weitzmani Ghedotti, Meisner & Lucinda, 2001
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Onesided livebearer