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1 August 2000 Life History of Phalloceros caudiomaculatus: A Novel Variation on the Theme of Livebearing in the Family Poeciliidae
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Abstract

We describe the life-history pattern of Phalloceros caudiomaculatus on the basis of wild-caught and preserved fish from four different South American locations and laboratory data on livestock from a fifth location. This species is matrotrophic; the estimated dry weight of the young at birth is up to five times the weight of eggs at fertilization. In addition, these fish lack superfetation, meaning that there is only one brood of developing young at a time. This observation suggests that matrotrophy and superfetation can evolve independently of one another. The size distribution of mature males was bimodal in two of three samples and significantly skewed in the third. Such size distributions have indicated the presence of a genetic polymorphism for age and size at maturity in other species of Poeciliidae.

The American Society of Ichthyologists and Herpetologists
Ai-Li Arias and David Reznick "Life History of Phalloceros caudiomaculatus: A Novel Variation on the Theme of Livebearing in the Family Poeciliidae," Copeia 2000(3), 792-798, (1 August 2000). https://doi.org/10.1643/0045-8511(2000)000[0792:LHOPCA]2.0.CO;2
Accepted: 11 January 2000; Published: 1 August 2000
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