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

Simple item page
dc.contributor.authorVoss, Robert S.en_US
dc.contributor.authorJansa, Sharon A.en_US
dc.date.accessioned2005-10-05T22:06:33Z
dc.date.available2005-10-05T22:06:33Z
dc.date.issued2003en_US
dc.description82 p. : ill. (some col.) ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 66-74).en_US
dc.description.abstractIn 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.extent2541458 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/444
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesBulletin of the American Museum of Natural History ; no. 276en_US
dc.subject.lccQH1 .A4 no.276 2003en_US
dc.subject.lcshOpossums -- Phylogeny.en_US
dc.subject.lcshOpossumsen_US
dc.subject.lcshDidelphimorphia -- Phylogeny.en_US
dc.subject.lcshMarmosa canescens -- Classification.en_US
dc.subject.lcshMarmosa -- Nomenclature.en_US
dc.subject.lcshMarsupials -- America -- Phylogeny.en_US
dc.subject.lcshMarsupials -- Evolution.en_US
dc.subject.lcshMammals -- America -- Phylogeny.en_US
dc.subject.lcshMammals -- Evolution -- America.en_US
dc.titlePhylogenetic 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. 276en_US
dc.title.alternativeNonmolecular data and new IRBP sequencesen_US
dc.title.alternativeSeparate and combined analyses of didelphine relationships with denser taxon samplingen_US
dc.title.alternativeDidelphid phylogenyen_US
dc.typetexten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
/v2/dspace/ingest/pdfSource/bul/B276.pdf
Size:
2.42 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Bulletin of the American Museum of Natural History