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The Baculum in the Chipmunks of Western North America   By:

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[Transcriber's Notes: The following change has been made to the text: Page 631, added closing parenthesis to "(genus Eutamias of California)"]

The Baculum in the Chipmunks of Western North America

BY

JOHN A. WHITE

University of Kansas Publications Museum of Natural History

Volume 5, No. 35, pp. 611 631, 19 figures in text December 1, 1953

University of Kansas LAWRENCE 1953

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman, A. Byron Leonard, and Robert W. Wilson

Volume 5, No. 35, pp. 611 631, 19 figures in text

December 1, 1953

UNIVERSITY OF KANSAS Lawrence, Kansas

PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1953

[Illustration]

24 8968

The Baculum in the Chipmunks of Western North America

By

JOHN A. WHITE

CONTENTS

PAGE

Introduction 613

Methods, Materials, and Acknowledgments 614

Variation 614

Key to the Bacula of the Species of Eutamias of Western North America 615

Accounts by Species 616 Eutamias alpinus 616 E. minimus 617 E. townsendii 618 E. sonomae 619 E. amoenus 619 E. dorsalis 620 E. merriami 621 E. quadrivittatus 621 E. ruficaudus 622 E. cinereicollis 624 E. quadrimaculatus 624 E. speciosus 625 E. panamintinus 625 E. umbrinus 626 E. palmeri 627 E. bulleri 627

Figures 1 19. Lateral views of bacula 629

Discussion 630

Literature Cited 631

INTRODUCTION

The baculum is the bony part of the penis. In the species of the subgenus Neotamias the proximal part of the baculum is termed the shaft, and the distal upturned part is termed the tip. On the dorsal side of the tip there is a longitudinal ridge termed the keel. The proximal end of the shaft is termed the base (see fig. 19). Depending on the species, the shaft varies from 2.11 to 5.28 mm. in length, and the base may or may not be widened or deepened.

The purpose of this report is to: (1) Show the usefulness of the structure of the baculum as a taxonomic character in chipmunks; and (2) compare a classification based on the structure of the baculum with a classification based on the structure and appearance of the skull and skin.

METHODS, MATERIALS, AND ACKNOWLEDGMENTS

The bacula which were borrowed from the University of Michigan, Museum of Zoology, were processed according to the method described by Friley (1947:395 397), whereas all others were processed according to the method described by White (1951:125). Thus the bacula that were borrowed from the University of Michigan, are maintained there in a separate collection, whereas the bacula borrowed from other museums and those that are at the University of Kansas, Museum of Natural History, are housed with the skulls of the corresponding specimens... Continue reading book >>




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