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A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains

A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains

Published on: January 16, 2026

A comparative study of mammalian diversification pattern.

Wenhua Yu¹, Junxiao Xu, Yi Wu

¹Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China.

International Journal of Biological Sciences

|March 30, 2012

Summary

This summary is machine-generated.

Mammalian diversification reveals rapid early radiations in Boreoeutheria and Euaustralidelphia. Extinction rates played a key role in shaping current taxonomic richness across mammalian groups.

Keywords:

MEDUSA diversification pattern mammal radiation

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Area of Science:

* Evolutionary Biology
* Mammalian Phylogenetics
* Diversification Dynamics

Background:

* Mammalian evolutionary history and diversification patterns remain incompletely understood.
* Conflicting higher-level phylogenies and lack of comprehensive comparative analyses hinder a clear picture.
* Understanding diversification is crucial for explaining current mammalian biodiversity.

Purpose of the Study:

* To investigate the diversification patterns across mammalian clades using a comprehensive phylogenetic supermatrix.
* To identify shifts in diversification rates and their potential drivers.
* To elucidate the role of extinction in shaping mammalian evolutionary history.

Main Methods:

* Utilized a recently published supermatrix covering nearly all extant mammalian families.
* Employed a novel comparative likelihood approach, MEDUSA (Modeling Evolutionary Diversification Using Stochasticity and Age).
* Conducted phylogenetic analyses at both order and family levels.

Main Results:

* Identified rapid early radiations in Boreoeutheria and Euaustralidelphia.
* Supported the Long Fuse model for placental diversification with a burst around 100 million years ago.
* Revealed seven clades with significant diversification rate shifts, including Muridae+Cricetidae and Bovidae+Moschidae+Cervidae.
* Indicated substantial roles for both speciation and extinction in shaping taxonomic richness.
* Highlighted the impact of extinction in obscuring historical diversification signals.

Conclusions:

* Early mammalian history was characterized by rapid radiations in key clades.
* Biogeographic events likely influenced marsupial radiation in Australia.
* Extinction is a critical factor in understanding mammalian diversity patterns and requires further investigation.