Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 13 March 1970:
Vol. 167. no. 3924, pp. 1504 - 1506
DOI: 10.1126/science.167.3924.1504
Prev | Table of Contents | Next

Articles

Line and Grade in the Extinct Medius Species Group of Sigmodon

Robert A. Martin 1

1 Department of Biology, South Dakota School of Mines and Technology, Rapid City 57701

Remains of Sigmodon minor and Sigmodon medius, extinct cotton rats comprising the medius species group, have been recovered from both Kansas and Arizona. Sigmodon minor evolved from Sigmodon medius, and the available evidence suggests that Kansas populations of Sigmodon minor were derived from Kansas populations of Sigmodon medius, while Arizona populations of Sigmodon minor were derived from Arizona populations of Sigmodon medius. This multiple origin of a single mammalian species is similar to the origin proposed by Carleton Coon for the races (subspecies) of Homo sapiens.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
LATE PLIOCENE AND EARLY PLEISTOCENE RODENTS FROM THE NORTHERN BORCHERS BADLANDS (MEADE COUNTY, KANSAS), WITH COMMENTS ON THE BLANCAN-IRVINGTONIAN BOUNDARY IN THE MEADE BASIN.
(2003)
Journal of Paleontology 77, 985-1001


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)