Jenynsia is a genus of freshwater fishes in the family Anablepidae. Like Anableps species, they are one-sided 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 viviparous. 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 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 centimeters (5 in) in females and about 4 cm (2 in) in males.

Jenynsia onca, commonly known as the one sided livebearer, is a member of the family Anablepidae. The opsin gene repertoires of J. onca's close relatives, the four-eyed fish (Anableps anableps) and the guppy (Poecilia reticulata), have been characterized and each found to include one unique LWS opsin. Currently, the relationship among LWS paralogs and orthologs in these species are unclear, making it difficult to test the hypotheses that link vision to morphology or life history traits. The phylogenetic signal appears to have been disrupted by gene conversion. Here we have sequenced the opsin genes of J. onca in order to resolve these relationships.

Description

Up for sale are (5)Jenynsia Onca livebearers, approximately 1"-2" in size. These are a left sided livebearer from Uruguay and are F-1s, meaning their parents are wild caught! SHIPPING POLICY - PLEASE READ: Live arrival is always guaranteed...

 

 

 

 

Jenynsia alternimaculata (Fowler, 1940)

Jenynsia diphyes Lucinda, Ghedotti & da Graҫa, 2006

Jenynsia eigenmanni (Haseman, 1911)

Jenynsia eirmostigma Ghedotti & S. H. Weitzman, 1995

Jenynsia lineata (Jenyns, 1842) (Onesided livebearer)

Jenynsia luxata Aguilera, Mirande, Calviño & Lobo, 2013

Jenynsia maculata Regan, 1906

Jenynsia multidentata (Jenyns, 1842) (Rio de la Plata onesided livebearer)

Jenynsia obscura (Weyenbergh (de), 1877)

Jenynsia onca Lucinda, R. E. dos Reis & Quevedo, 2002

Jenynsia sanctaecatarinae Ghedotti & S. H. Weitzman, 1996

Jenynsia tucumana Aguilera & Mirande, 2005

Jenynsia unitaenia Ghedotti & S. H. Weitzman, 1995

Jenynsia weitzmani Ghedotti, A. D. Meisner & Lucinda, 2001

 

 

The opsin repertoire of Jenynsia onca: a new perspective on gene duplication and divergence in livebearers