Onesided livebearer

Onesided livebearer
Onesided livebearers
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cyprinodontiformes
Family: Anablepidae
Subfamily: Anablepinae
Genus: Jenynsia
Günther, 1866
Type species
Lebias lineata
Jenyns, 1842

See text.

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 fish are viviparous.[3]



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.[3]


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.[4][1] 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.[3] Members of the two subgenera are partially sympatric in southeastern Brazil.[4]


Unlike their cousins Anableps, their eyes are normal.[1] 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.[4] The maximum length in these species is up to 12 centimetres (5 in) in females and about 4 cm (2 in) in males.[1]


Subgenera and species according to Ghedotti, 2001 and Lucinda et al., 2006.[3][4]

Subgenus Jenynsia

  • Jenynsia alternimaculata (Fowler, 1940)
  • Jenynsia lineata (Jenyns, 1842)
  • Jenynsia maculata Regan, 1906
  • Rio de la Plata onesided livebearer, Jenynsia multidentata (Jenyns, 1842)
  • Jenynsia onca Lucinda, Reis & Quevedo, 2002
  • Jenynsia pygogramma Boulenger, 1902
  • Jenynsia sanctaecatarinae Ghedotti & Weitzman, 1996
  • Jenynsia tucumana Aguilera & Mirande, 2005[5]

Subgenus Plesiojenynsia Ghedotti, 1998

  • Jenynsia diphyes Lucinda, Ghedotti & Graça, 2006[4]
  • Jenynsia eigenmanni (Haseman, 1911)
  • Jenynsia eirmostigma Ghedotti & Weitzman, 1995
  • Jenynsia unitaenia Ghedotti & Weitzman, 1995
  • Jenynsia weitzmani Ghedotti, Meisner & Lucinda, 2001[3]


  1. ^ a b c d Nelson, Joseph S. (2006). Fishes of the World. John Wiley & Sons, Inc. ISBN 0-471-25031-7. 
  2. ^ Bisazza, Angelo; Silvia Manfredi and 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: 961-978. 
  3. ^ a b c d e Ghedotti, Michael J.; Meisner, Amy Downing; Lucinda, Paulo H. F. (2001). Schaefer, S. A.. ed. "New Species of Jenynsia (Teleostei: Cyprinodontiformes) from Southern Brazil and Its Phylogenetic Relationships". Copeia 2001 (3): 726–736. doi:10.1643/0045-8511(2001)001[0726:NSOJTC]2.0.CO;2. ISSN 0045-8511. 
  4. ^ a b c d e Lucinda, Paulo H. F.; Ghedotti, Michael J.; Graça, Weferson J. (2006). Armbruster, J. W.. ed. "A New Jenynsia Species (Teleostei, Cyprinodontiformes, Anablepidae) from Southern Brazil and its Phylogenetic Position". Copeia 2006 (4): 613–622. doi:10.1643/0045-8511(2006)6[613:ANJSTC]2.0.CO;2. ISSN 0045-8511. 
  5. ^ Aguilera, Gastón; Mirande, Juan Marcos (2005). "A new species of Jenynsia (Cyprinodontiformes: Anablepidae) from northwestern Argentina and its phylogenetic relationships" (PDF). Zootaxa 1096: 29–39. Retrieved 2009-06-25. 

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