Gambusia quadruncus Langerhans, 2012
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 Family:  Poeciliidae (Poeciliids), subfamily: Poeciliinae
 Max. size:  2.79 cm SL (male/unsexed)
 Environment:  benthopelagic
 Distribution:  Central America: Mexico within the following drainages: Río Guayalejo-Tamesí, Río Pánuco, Laguna de Tamiahua, Río Tigre, Río Carrizal and Río Soto La Marina.
 Diagnosis:  Dorsal soft rays (total): 7-9; Anal soft rays: 9-11; Vertebrae: 30-33. Belongs to the affinis species group and differs from all other members of this group by the following combination of characters: terminal hook at the distal tip of the gonopodium formed by rays 4a, 4p or both; elbow on gonopodial ray 4a positioned more distal relative to serrae (typically positioned one segment or more distal to serrae) and anal spots in females that are permanent, more prominent and positioned more posteriorly than other members (typically spanning the second to fifth or sixth rays) (Ref. 91760).
 Biology:  Occurs in a wide range of habitats such as ponds, drainage ditches, lakes, wetlands, brackish lagoons, large rivers and swiftly flowing spring-fed streams (Ref. 91760).
 IUCN Red List Status: Not Evaluated  (Ref. 96402)
 Threat to humans:  harmless
 Country info:   
 

 Entered by: Torres, Armi G. - 07.08.13

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