Abstract
Phenetic and phylogenetic methods of analysis of allozymic data were used to determine relationships among members of the South American genus Platemys (P. pallidipectoris, P. spixii, P. macrocephala, P. radiolata, and P. platycephala). Two members of the related genus Phrynops (P. gibbus and P. rufipes) were used in the phylogenetic analysis to determine character state polarities. Comparison of the biochemical analyses to those from chromosomal and morphological data indicated a general concordance between the data sets and supports specific status for all five members of the Platemys group. Platemys platycephala appears to be the most divergent member of the genus.
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