Literaturdatenbank
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Lamb, T., & Lydearg, C. (1994). A molecular phylogeny of the gopher tortoises, with comments on familial relationships within testudinoidea. Molecular Phylogenetics and Evolution, 3, 291.
Added by: Sarina Wunderlich (23 Aug 2008 14:56:17 UTC) |
| Resource type: Journal Article BibTeX citation key: Lamb1994 View all bibliographic details  |
Categories: General Keywords: Geoemydidae, Gopherus, Gopherus agassizii, Gopherus berlandieri, Gopherus flavomarginatus, Gopherus polyphemus, Schildkröten = turtles + tortoises, Systematik = taxonomy, Testudinidae Creators: Lamb, Lydearg Collection: Molecular Phylogenetics and Evolution |
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| Abstract |
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Testudinidae Gopherus Sequences from the mitochondrial cytochrome b gene were obtained to examine molecular phylogenetic relationships among the North American gopher tortoises. Data from 352 aligned positions generated a single most-parsimonious tree for each of three analytical approaches: (1) equal weighting, all substitutions; (2) equal weighting, third position changes limited to transversions; and (3) transversions weighted 10 times transitions. Identical topologies for the resulting trees depict the gopher tortoises as a monophyletic group comprising two well-defined clades. Observed sequence divergence (7.0%) between the agassizii (Gopherus agassizii; G. berlandieri) and the polyphemus (G. flavomarginatus; G. polyphemus) clades suggests an Early Miocene separation of these lineages. The cytochrome b phylogeny complements some previous systematic interpretations, including formal taxonomic recognition of the two distinct groups, but is at odds with the most recent morphological analysis. Additional sequence comparisons of selected testudinoid (batagurid, emydid, and testudinid) taxa yielded a phylogeny consistent with a morphologically based hypothesis demonstrating close phylogenetic affinities between the Testudinidae and the "Bataguridae."
Added by: Sarina Wunderlich |