Onesided livebearer explained

Jenynsia is a genus of freshwater fishes in the 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.[1] However, other sources dispute this.[2] These South American fish are 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 Andean drainages of northwest Argentina and southern Bolivia.

Taxonomy

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.[1] Jenynsia contains two subgenera. Members of the subgenus Plesiojenynsia 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.

Description

Unlike their cousins Anableps, their eyes are normal.[1] Jenynsia species are diagnosable by the possession of an unscaled tubulargonopodium 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 (5 in) in females and about 4 cm (2 in) in males.[1]

Species

There are currently 15 recognized species in this genus:

Notes and References

  1. Book: Nelson, Joseph S.. Fishes of the World. John Wiley & Sons, Inc. 2006. 0-471-25031-7.
  2. Bisazza. Angelo . Silvia Manfredi . Andrea Pilastro . 2000 . Sexual Competition, Coercive Mating and Mate Assessment in the One-Sided Livebearer, Jenynsia multidentata: Are They Predictive of Sexual Dimorphism? . Ethology . 106 . 11 . 961–978 . 10.1046/j.1439-0310.2000.00620.x. 2000Ethol.106..961B .
  3. A New Jenynsia Species (Teleostei, Cyprinodontiformes, Anablepidae) from Southern Brazil and its Phylogenetic Position. Paulo H. F.. Lucinda. Ghedotti, Michael J. . Graça, Weferson J. . Copeia. 2006. 4. 613–622. 10.1643/0045-8511(2006)6[613:ANJSTC]2.0.CO;2. 2006. 86000684 . 0045-8511. Armbruster. J. W..
  4. Aguilera, G., Mirande, J.M., Calviño, P.A. & Lobo, L.F. (2013): Jenynsia luxata, a new species from Northwestern Argentina, with additional observations of J. maculata Regan and phylogeny of the genus (Cyprinodontiformes: Anablepidae). Neotropical Ichthyology, 11 (3): 565-572.
  5. Aguilera. Gastón. Terán. Guillermo Enrique. Mirande. Juan Marcos. Alonso. Felipe. Rometsch. Sina. Meyer. Axel. Torres-Dowdall. Julian. 2019-07-10. Molecular and morphological convergence to sulfide-tolerant fishes in a new species of Jenynsia (Cyprinodontiformes: Anablepidae), the first extremophile member of the family. PLOS ONE. en. 14. 7. e0218810. 10.1371/journal.pone.0218810. 1932-6203. 6619989. 31291282. 2019PLoSO..1418810A. free.
  6. A new species of Jenynsia (Cyprinodontiformes: Anablepidae) from northwestern Argentina and its phylogenetic relationships. Gastón. Aguilera. Mirande, Juan Marcos. Zootaxa. 1096. 29–39. 2005. 10.11646/zootaxa.1096.1.3. 2009-06-25.
  7. Copeia. 2001. 3. 726–736. New Species of Jenynsia (Teleostei: Cyprinodontiformes) from Southern Brazil and Its Phylogenetic Relationships. Michael J.. Ghedotti. Meisner, Amy Downing . Lucinda, Paulo H. F. . 10.1643/0045-8511(2001)001[0726:NSOJTC]2.0.CO;2. 2001. 85678530 . 0045-8511. Schaefer. S. A..

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