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Phylogenetic studies on didelphid marsupials. 2, Nonmolecular data and new IRBP sequences : separate and combined analyses of didelphine relationships with denser taxon sampling. Bulletin of the AMNH ; no. 276

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dc.contributor.author Voss, Robert S. en_US
dc.contributor.author Jansa, Sharon A. en_US
dc.date.accessioned 2005-10-05T22:06:33Z
dc.date.available 2005-10-05T22:06:33Z
dc.date.issued 2003 en_US
dc.identifier.uri http://hdl.handle.net/2246/444
dc.description 82 p. : ill. (some col.) ; 26 cm. en_US
dc.description Includes bibliographical references (p. 66-74). en_US
dc.description.abstract In order to test the results of a previous study of didelphid marsupial phylogeny based on IRBP nuclear gene sequences (Jansa and Voss, 2000. Phylogenetic studies on didelphid marsupials I. Introduction and preliminary results from nuclear IRBP gene sequences. Journal of Mammalian Evolution 7: 43-77), we surveyed external, cranial, dental, and karyotypic characters among a more densely taxon-sampled didelphine ingroup. Separate maximum-parsimony analyses of these nonmolecular data and of a new (taxon-dense) IRBP matrix yielded superficially dissimilar strict-consensus topologies. However, no didelphine clade that was even moderately well supported by either separate analysis was contradicted by any equivalently well-supported clade in the other. Instead, all examples of taxonomic incongruence involved weak nodal support from one or both datasets. A maximum-likelihood analysis of the IRBP data produced a consensus topology that was completely congruent with, although slightly more resolved than, the maximum-parsimony consensus. A combined (simultaneous) maximum-parsimony analysis of both datasets (nonmolecular + IRBP) produced a consensus topology that closely resembled the results of analyzing IRBP separately. Most of the didelphine relationships previously reported by Jansa and Voss (op. cit.) are supported by these analytic exercises, with some notable exceptions. The taxon currently known as Marmosa canescens is conspicuously divergent from congeneric species and variously clusters with three different groups ("other Marmosa" + Micoureus, Monodelphis, or higher didelphines (= clade H of Jansa and Voss, op. cit.)) in several parsimony-equivalent resolutions of a fourfold basal polytomy in the IRBP and combined-data consensus topologies. Even without canescens, however, the genus Marmosa is not demonstrably monophyletic. The nomenclatural consequences of these results are discussed, and a new genus is described for "Marmosa" canescens. Future analyses should test the monophyly of other speciose didelphine genera, but new sources of character data will be needed to offset the loss of resolution and decreased nodal support that are often caused by denser taxon sampling. en_US
dc.format.extent 2541458 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries Bulletin of the American Museum of Natural History ; no. 276 en_US
dc.subject.lcc QH1 .A4 no.276 2003 en_US
dc.subject.lcsh Opossums -- Phylogeny. en_US
dc.subject.lcsh Opossums en_US
dc.subject.lcsh Didelphimorphia -- Phylogeny. en_US
dc.subject.lcsh Marmosa canescens -- Classification. en_US
dc.subject.lcsh Marmosa -- Nomenclature. en_US
dc.subject.lcsh Marsupials -- America -- Phylogeny. en_US
dc.subject.lcsh Marsupials -- Evolution. en_US
dc.subject.lcsh Mammals -- America -- Phylogeny. en_US
dc.subject.lcsh Mammals -- Evolution -- America. en_US
dc.title Phylogenetic studies on didelphid marsupials. 2, Nonmolecular data and new IRBP sequences : separate and combined analyses of didelphine relationships with denser taxon sampling. Bulletin of the AMNH ; no. 276 en_US
dc.title.alternative Nonmolecular data and new IRBP sequences en_US
dc.title.alternative Separate and combined analyses of didelphine relationships with denser taxon sampling en_US
dc.title.alternative Didelphid phylogeny en_US
dc.type text en_US


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  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

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