Reithrodon group sensu stricto
Phyllotines with sigmodont molarsScott J. Steppan
- new genus T
Members of the Reithrodon group all have high-crowned (hypsodont), simplied (without most accessory cusps), and involuted molars for grinding, grooved incisors, and deeply excavated parapterygoid fossa, among other features. The shape of the third molar led to the description "sigmodont" molars (Hershkovitz 1962). However, the most distinctive feature is a synapomorphy for the Reithrodon group sensu stricto, a sharply angled premaxillo-maxillary suture, a trait unique among New World muroids. In contrast, the molar charcteristcs have evolved to varying degrees convergently in a variety of unrelated muroids in presumptive adaptation to a fibrous diet.
Scott J. Steppan
Florida State University, Tallahassee, Florida, USA
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Page copyright © 1996 Scott J. Steppan
All Rights Reserved.
- First online 01 October 1996
Citing this page:
Steppan, Scott J. 1996. Reithrodon group sensu stricto. Phyllotines with sigmodont molars. Version 01 October 1996 (under construction). http://tolweb.org/Reithrodon_group_sensu_stricto/16695/1996.10.01 in The Tree of Life Web Project, http://tolweb.org/