An analysis of marsupial interordinal relationships based on 12S rRNA, tRNA valine, 16S rRNA, and cytochrome b sequences

被引：14
作者：
Burk A. [1 ]
Westerman M. [2 ]
Kao D.J. [1 ]
Kavanagh J.R. [1 ]
Springer M.S. [1 ]
机构：
[1] Department of Biology, University of California, Riverside
[2] Department of Genetics and Human Variation, La Trobe University, Bundoora
来源：
Journal of Mammalian Evolution | 1999年 / 6卷 / 4期
基金：
美国国家科学基金会;
关键词：
12S ribosomal RNA; 16S ribosomal RNA; Cytochrome b; Marsupials; Metatheria; Systematics;
D O I：
10.1023/A:1027305910621
中图分类号：
学科分类号：
摘要：
The basal split among living marsupials is traditionally placed between the cohorts Ameridelphia and Australidelphia. Ameridelphia includes all American forms excepting the South American Dromiciops gliroides (Order Microbiotheria). Australidelphia includes all Australasian taxa plus Dromiciops gliroides. DNA data support Eometatheria (Dromiciops + Diprotodontia + Dasyuromorphia + Notoryctemorphia) but do not resolve the position of bandicoots, whether with other australidelphians or with ameridelphians. Also, the most robust molecular trees (DNA hybridization, multigene studies) exhibit minimal branch subdivision and raise the possibility of artifactual associations owing to long branch attraction. We analyzed data sets that consisted of complete sequences for four mitochondrial genes (cytochrome b, 12S rRNA, tRNA valine, 16S rRNA). One data set included 14 marsupial taxa. A second data set included 14 marsupials as well as outgroup sequences (one monolreme; 20 placentals). Phylogenetic analyses included parsimony, minimum evolution, maximum likelihood, and quartet puzzling. When phylogenetic analyses were restricted to just the marsupial sequences, there was 75 to 96% boostrap support for the separation of Ameridelphia versus Australidelphia. This suggests that either one or both of these groups are monophyletic. Also, there was 71 to 98% bootstrap support for the separation of Eometatheria versus Ameridelphia + Peramelina. Nonmonophyly of several a priori clades was accepted by at least some statistical tests including the following: Diprotodonlia + Peramelina, Notoryctemorphia + Peramelina, Diprotodonlia + Notoryctemorphia, and the monophyly of Australasian marsupials. With the inclusion of outgroup sequences, there was reduced bootstrap support for associations among marsupial orders and statistical tests failed to reject all interordinal associations that were tested. © 1999 Plenum Publishing Corporation.
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页码：317 / 334
页数：17
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