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Mammalian phylogeny inferred from multiple protein data

K Kuma¹, T Miyata

¹Department of Biophysics, Faculty of Science, Kyoto University, Japan.

Idengaku Zasshi

|October 1, 1994

Summary

This study analyzed eutherian mammal phylogeny using protein data. Results support rodent monophyly and suggest Lagomorpha are more closely related to Primates than Rodentia.

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Area of Science:

Evolutionary Biology
Mammalian Phylogenetics
Molecular Systematics

Background:

Understanding the evolutionary relationships among major eutherian mammal groups is crucial for mammalian classification and evolutionary studies.
Previous phylogenetic analyses have yielded conflicting results regarding rodent monophyly and the placement of Lagomorpha.

Purpose of the Study:

To reconstruct the phylogenetic relationships among major eutherian mammal clades using multiple protein datasets.
To re-evaluate the hypothesis of rodent polyphyly and clarify the phylogenetic position of Lagomorpha.

Main Methods:

Phylogenetic analyses were conducted using maximum likelihood (ML), maximum parsimony (MP), and neighbor joining (NJ) methods.
Multiple protein datasets, including mitochondrial DNA-coded proteins, were utilized for phylogenetic reconstruction.
The study analyzed data from various mammalian groups: Primates, Cetacea, Artiodactyla, Carnivora, Lagomorpha, Myomorpha, and Caviomorpha.

Main Results:

ML analysis rejected rodent polyphyly, supporting the monophyly of Rodentia (Myomorpha-Caviomorpha association).
Lagomorpha were found to be more closely related to Primates than to Rodentia.
The branching order suggests a bush-like divergence pattern for these mammals, with rapid rodent evolution.

Conclusions:

The study provides strong molecular evidence for rodent monophyly and a revised placement of Lagomorpha within eutherian phylogeny.
The findings contribute to a more robust understanding of mammalian evolutionary history and diversification.
The rapid rate of rodent evolution warrants further investigation in the context of this new phylogenetic framework.

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