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Phylogenetics of Perissodactyla and Tests of the Molecular Clock Jane E. Norman, Mary V. Ashley
 

Summary: Phylogenetics of Perissodactyla and Tests of the Molecular Clock
Jane E. Norman, Mary V. Ashley
Department of Biological Sciences, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL 60607-7060, USA
Received: 6 January 1999 / Accepted: 2 August 1999
Abstract. Two mitochondrial genes, the protein-
coding cytochrome c oxidase subunit II (COII) gene and
a portion of the 12S rRNA gene, were used for phylo-
genetic investigation of the mammalian order Peris-
sodactyla. The primary objective of the study was to
utilize the extensive fossil record of perissodactyls for
calibrating molecular clocks and comparing estimates of
divergence times using both genes and two fossil cali-
bration points. Secondary objectives included clarifica-
tion of previously unresolved relationships within Tap-
iridae and comparison of the results of separate and
combined analyses of two genes. Analyses included sev-
eral perissodactyl lineages representing all three families
(Tapiridae, Equidae, and Rhinocerotidae), most extant
genera, all four species of tapirs, two to four species of
rhinoceros, and two species of Equus. The application of

  

Source: Ashley, Mary V. - Department of Biological Sciences, University of Illinois at Chicago

 

Collections: Biology and Medicine; Environmental Sciences and Ecology