An Analysis of Marsupial Interordinal Relationships Based on 12S rRNA, tRNA Valine, 16S rRNA, and Cytochrome b Sequences

摘要: The basal split among living marsupials is traditionally placed between the cohorts Ameridelphiaand Australidelphia. Ameridelphia includes all American forms excepting South AmericanDramicuipx gliroidex (Order Microbiotheria). Australidelphia Australasian taxaplus Dromiciops glinmles. DNA data support Eometatheria Dromiciaps + Diprotodontia +Dasyuromorphia Notoryctemorphia) but do not resolve position of bandicoots, whetherwith other australidelphians or with ameridelphians. Also, most robust molecular trees (DNAhybridization, multigene studies) exhibit minimal branch subdivision and raise possibility ofartit'actual associations owing to long attraction. We analyzed sets that consistedof complete sequences tor four niitochondrial genes (cytochrome b, 12S rRNA, tRNA valine,16S rRNA). One set included 14 marsupial taxa. A second marsupialsas well as outgroup (one monolreme; 20 placentals). Phylogenetic analyses includedparsimony, minimum evolution, maximum likelihood, quartet puzzling. When phylogeneticanalyses were restricted just sequences, there was 75 96% boostrap supportfor separation versus This suggests either one orboth these groups are monophyletic. 71 98% bootstrap for theseparation Peramelina. Nonmonophyly several a prioriclades accepted by at least some statistical tests including following: Diprotodontia+ Peramelina, Notoryctemorphia Diprotodonlia Notoryctemorphia, themonophyly marsupials. With inclusion wasreduced orders failed toreject interordinal tested.