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Species Limits, Phylogenetic Relationships, and Origins of Viviparity in the Scalaris Complex of the Lizard Genus Sceloporus (Phrynosomatidae: Sauria)

Daniel G. Mink and Jack W. Sites, Jr.
Herpetologica
Vol. 52, No. 4 (Dec., 1996), pp. 551-571
Published by: Allen Press on behalf of the Herpetologists' League
Stable URL: http://www.jstor.org/stable/3893213
Page Count: 21
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Species Limits, Phylogenetic Relationships, and Origins of Viviparity in the Scalaris Complex of the Lizard Genus Sceloporus (Phrynosomatidae: Sauria)
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Abstract

We electrophoretically assayed 32 gene loci in the Sceloporus scalaris complex. We sampled 208 animals from 22 localities representing the following: Sceloporus aeneus (12 localities), S. bicanthalis (five localities), S. chaneyi (one locality), S. goldmani (one locality), and S. scalaris samcolemani (two localities), and we used Sceloporus parvus and S. variabilis as outgroups. Of the 32 gene loci, 11 were uninformative, 10 were polymorphic both within and among species, and 11 were polymorphic among species but monomorphic within species. Thirteen diagnostic loci, plus two morphological characteristics (number of canthal scales and male belly patterns) and the type of parity mode present, define a total of eight genetically and/or morphologically distinct ingroup units. Cladistic analysis of these markers suggests at least two separate origins of viviparity within the complex (based on the most parsimonious trees from the cladistic analysis), as well as the possibility of reproductively bimodal groups within the complex. A phylogenetic hypothesis of the complex is presented.

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