Biology Faculty Articles

Title

Molecular Phylogenetics and the Origins of Placental Mammals

Document Type

Article

Publication Date

2-1-2001

Publication Title

Nature

ISSN

0028-0836

Volume

409

Issue/No.

6822

First Page

614

Last Page

618

Abstract

The precise hierarchy of ancient divergence events that led to the present assemblage of modern placental mammals has been an area of controversy among morphologists, palaeontologists and molecular evolutionists.Here we address the potential weaknesses of limited character and taxon sampling in a comprehensive molecular phylogenetic analysis of 64 species sampled across all extant orders of placental mammals. We examined sequence variation in 18 homologous gene segments (including nearly 10,000 base pairs) that were selected for maximal phylogenetic informativeness in resolving the hierarchy of early mammalian divergence. Phylogenetic analyses identify four primary superordinal clades: (I) Afrotheria (elephants, manatees, hyraxes, tenrecs, aardvark and elephant shrews); (II) Xenarthra (sloths, anteaters and armadillos); (III) Glires (rodents and lagomorphs), as a sister taxon to primates, ¯ying lemurs and tree shrews; and (IV) the remaining orders of placental mammals (cetaceans, artiodactyls, perissodactyls, carnivores, pangolins, bats and core insectivores). Our results provide new insight into the pattern of the early placental mammal radiation.

Comments

©2001 Macmillan Magazines Ltd

Additional Comments

GenBank accession #s: AY011125-AY012154

ORCID ID

0000-0001-7353-8301

ResearcherID

N-1726-2015

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