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Title: A New Subspecies of Bat (Myotis velifer) from Southeastern California and Arizona

Author: Terry A. Vaughan

Release Date: February 8, 2010 [EBook #31220]

Language: English

Character set encoding: ISO-8859-1

*** START OF THIS PROJECT GUTENBERG EBOOK NEW BAT SUBSPECIES (MYOTIS VELIFER) ***




Produced by Chris Curnow, Joseph R. Hauser, Joseph Cooper
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University of Kansas Publications Museum of Natural History

Volume 7, No. 8, pp. 507-512

July 23, 1954

A New Subspecies of Bat (Myotis velifer)
from Southeastern California and Arizona

BY

TERRY A. VAUGHAN

University of Kansas
Lawrence
1954

University or Kansas Publications, Museum of Natural History

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


Volume 7, No. 8, pp. 507-512
Published July 23, 1954


University of Kansas
Lawrence, Kansas

PRINTED BY
FERD VOILAND. JR., STATE PRINTER
TOPEKA, KANSAS
1954

25-3727

A New Subspecies of Bat (Myotis velifer) from Southeastern California
and Arizona

BY
TERRY A. VAUGHAN

The first specimens of Myotis velifer from California were taken in 1909 by C. L. Camp at Needles, San Bernardino County (Grinnell, Univ. California Publ. Zool., 12:266, March 20, 1914), and subsequently this bat was recorded from farther south in the lower Colorado River Valley at the Riverside Mountains, Riverside County (Stager, Jour. Mamm., 20:226, May 14, 1939). West of the Rocky Mountains the species is known to occur also in at least the southern two-thirds of Arizona, southwestern New Mexico, and is recorded from Thistle Valley, Utah, on the basis of two young specimens in alcohol (Miller and Allen, Bull. U. S. Nat. Mus., 144:87, May 25, 1928). Through comparisons made possible by the acquisition, in the last few years, of mammals from many parts of Mexico by the Museum of Natural History of the University of Kansas, it became evident that Myotis velifer in California and Arizona was an heretofore unnamed subspecies. It may be known as

Myotis velifer brevis new subspecies

TABLE 1.—Measurements, in Millimeters, of Myotis velifer

Remarks.—Miller and Allen (op. cit. :90) considered specimens of Myotis velifer from Roosevelt, Arizona, to be intergrades between M. v. velifer and M. v. incautus because the color varied greatly and certain pale individuals resembled incautus. These workers regarded specimens from southern Arizona as nearly typical examples of M. v. velifer. I have examined the specimens from Roosevelt, Arizona, and many from various localities in the southern part of the state, and was impressed by the large amount of color varia[Pg 511]tion. Marked variation in color at a single locality, however, is known in other bats. Benson (Jour. Mamm., 30:50, February 14, 1949), for example, found striking variation in Myotis volans in California. The specimens of Myotis velifer from Roosevelt, Arizona, referred to M. v. velifer by Miller and Allen (op. cit. :90), actually average significantly smaller than specimens of this subspecies from Mexico, and than specimens of the large subspecies M. v. incautus from the Great Plains, and therefore, with reference to size, are not intergrades between these subspecies. All of the Arizonan material is here referred to M. v. brevis.

The "bald spot," that is to say, the sparsely furred area between the shoulders, which is characteristic of this species, reaches its most extreme condition in Myotis velifer brevis. In most of thirty-five specimens taken in mid-June, 1953, in California, the nape of the neck, the interscapular area, and a connected area extending laterally onto each shoulder are so lightly furred that the skin shows through conspicuously. In one male of this series a strip approximately four millimeters wide extending along the mid-dorsal line from between the shoulders to the rump is mostly devoid of hair. These sparsely-furred areas are less evident in live animals than in study skins and specimens in alcohol, because the back of the head in life lies against the depression between the shoulders and conceals most of the thinly furred areas.

The pelage of Myotis velifer brevis is shorter than that of either M. v. velifer or M. v. incautus and gives the impression of being less dense. The dorsal hairs average approximately 4.5 millimeters long in M. v. brevis taken 35 miles north of Blythe, Riverside County, California, in May, eight millimeters in M. v. velifer collected at Las Vigas, Veracruz, in January, and six millimeters in M. v. incautus taken four and one half miles southwest of Sun City, Barber County, Kansas, in November. More than seasonal differences in length of pelage is indicated by measurements of additional specimens of each subspecies taken at different times of the year.

Considering its extensive geographic range and its occurrence in many contrasting environments, Myotis velifer varies little; and the variation that does occur is continuous. The change from the large, dark Mexican subspecies to the small, pale Arizonan subspecies is gradual. The reason may lie in the ecology of M. velifer. It seems that there are few barriers separating populations. Waterless areas and regions lacking suitable roosting places such as fissures in cliffs and outcrops of rocks, caves and buildings, may exclude the species from certain areas, but there are few areas of any great size within[Pg 512] the range of the species that lack these features. Also, these bats are strong fliers; even between fairly distant colonies there may be considerable gene flow. The geographic variation observed probably is the result of adaptation, on the part of populations in different parts of the range of the species, to different environments. The lack of any effective barriers except possibly distance between populations tends to limit subspeciation and to cause gradual variation between subspecies. M. v. peninsularis, the subspecies at the southern tip of Baja California, is not considered in this discussion. So far as known, however, that subspecies is completely isolated from the mainland populations of M. velifer.

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