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Virtual Extinction of Gambusia amistadensis n. sp., a Poeciliid Fish from Texas
Alex E. Peden
Vol. 1973, No. 2 (May 22, 1973), pp. 210-221
Stable URL: http://www.jstor.org/stable/1442959
Page Count: 12
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Gambusia amistadensis n. sp. is described from Goodenough Spring which flowed into the Rio Grande in Val Verde County, Texas. It is related to the G. gaigei, G. alvarezi and G. hurtadoi complex of the nobilis species group but differs from these species in being more slender, having a more terminal mouth with more teeth on each jaw and males having longer serrae on gonopodial ray 4p. The new species is also related to, but differs from, G. senilis in that males have fewer segments in the elbow of gonopodial ray 4a and females have a permanent median dark anal spot. The newly constructed (1968) Amistad Reservoir on the Rio Grande has inundated Goodenough Spring with more than 30 meters of water. Although some individuals from this population survive in artificial ponds and aquaria, the indigenous stock of G. amistadensis is presumably extinct.