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Gonopodial system review and a new fish record of Poeciliopsis infans(Cyprinodontiformes: Poeciliidae)
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| Abstract | collected at Lake Patzcuaro. Morphometric and meristic counts were conducted on a random selection of 40 organisms of both sexes of Poeciliopsis infans. Males of these viviparous fish posses a modified anal fin called gonopodium. The characteristic hemal spine on the 18thcaudal vertebra for this species is described herein and the bony components of the gonopodial structure and suspensoria that together comprise the gonopodial system, which is important for taxonomic studies at various levels of classification were reviewed. Poeciliopsis infans displays a high degree of sexual dimorphism in body shape and anal fin anatomy with the most conspicuous dif-ference observed in anal fin height, which averages 40 % of Sl in males and 17 % in females. Comparisons between male and female anal fins are described herein as well as the possible impacts of this species on Lake Patzcuaro fish fauna. Key words:Gonopodial suspensoria, introducted species, lake, Patzcuaro, Poeciliidae, Poeciliopsis infans. Rev. Biol. Trop. 50(3/4): 1151-1157, 2002 www.ucr.ac.cr www.ots.ac.cr www.ots.duke.edu The Poeciliinae are viviparous cyprin-odonts in which the anal fin of the male is advanced and modified into an intromitent organ. The differences in structure of this organ make for a great systematic importance (Regan 1913). This poeciliid species, which is described below, has been collected in Lake Patzcuaro since February 1997. Previously, many ichthy-ological studies have been conducted in this geographical area (Meek 1904, Hubbs and Turner 1939, De Buen 1944, 1946, Barbour 1973) and many fish species lists have been published, especially within the last twenty years in which they were written (Rosas 1976, |
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