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A New Subspecies of the Black Myotis (Bat) from Eastern Mexico By: E. Raymond (Eugene Raymond) Hall (1902-1986) |
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MUSEUM OF NATURAL HISTORY Volume 14, No. 4, pp. 69 72, 1 fig.
December 29, 1961
A New Subspecies of the Black Myotis (Bat)
From Eastern Mexico BY E. RAYMOND HALL AND TICUL ALVAREZ
UNIVERSITY OF KANSAS
LAWRENCE
1961
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch,
Theodore H. Eaton, Jr.
Volume 14, No. 4, pp. 69 72, 1 fig.
Published December 29, 1961
UNIVERSITY OF KANSAS
Lawrence, Kansas
PRINTED BY
JEAN M. NEIBARGER, STATE PRINTER
TOPEKA, KANSAS
1961
[Device]
28 8477
A New Subspecies of the Black Myotis (Bat) From Eastern Mexico BY E. RAYMOND HALL AND TICUL ALVAREZ
In 1928 when Miller and Allen (Bull. U. S. Nat. Mus., 144) published
their revisionary account of American bats of the genus Myotis , the
black myotis, Myotis nigricans , was known no farther north than
Chiapas and Campeche. Collections of mammals made in recent years for
the Museum of Natural History of The University of Kansas include
specimens of M. nigricans from eastern Mexico as far north as
Tamaulipas. Critical study of this newly acquired material reveals that
it pertains to an hitherto unnamed subspecies that may be named and
described as follows:
MYOTIS NIGRICANS DALQUESTI new subspecies Type. Male, adult, skin and skull, No. 23839 Museum of Natural
History, University of Kansas; from 3 km. E of San Andrés Tuxtla, 1000
ft., Veracruz; obtained on January 5, 1948, by Walter W. Dalquest,
original No. 8444. Range. Tropical Life zone of eastern México from southern Tamaulipas
to central Chiapas. Diagnosis. Color black or dark brown, venter having brownish wash;
size large (see measurements); M1 and M2 quadrangular; prominent
protostyle on P4; P2 and P3 in straight line; sagittal crest absent. Comparison. Color almost as in Myotis nigricans extremus , the
subspecies occurring adjacent to dalquesti in Chiapas and Tabasco.
From M. n. extremus , dalquesti differs as follows: larger; hypocone
in M1 and M2 broader making posterointernal part less rounded;
protostyle of P4 prominent instead of absent; P3 in line with C and P2
instead of displaced lingually; sagittal crest absent instead of present
posteriorly. Myotis nigricans nigricans and M. n. dalquesti are of
approximately equal size; otherwise they differ in the same features as
do extremus and dalquesti . Measurements. Average and extreme measurements of seven males from
the type locality, followed by those of 19 females from 38 km. SE Jesús
Carranza, and finally length of forearm and cranial measurements of
eight female topotypes of M. n. extremus , are as follows: Total
length, 80 (77 82), 76 (72 80); length of tail, 32.8 (30 35), 33.5
(31 35); hind foot, 7.9 (7 8), 8.0 (8 8); forearm, 34.2 (33.6 35.3),
35.1 (33.1 36.4), 33.1 (31.8 34.3); greatest length of skull (including
incisors), 13.8 (13.3 14.1), 13.6 (13.2 14.1), 12.9 (12.6 13.1);
zygomatic breadth, 8.1 (7.9 8.4), 8.1 (7.9 8.3), 8.0 (only one can be
measured); width of rostrum above canines, 3.2 (3.1 3.3), 3.2 (3.0 3.4),
3.1 (3.0 3.2); interorbital constriction, 3.6 (3.5 3.7), 3.6 (3.5 3.8),
3.4 (3.3 3.4); occipital depth (excluding auditory bullae and sagittal
crest), 4.6 (4.4 4.8), 4.6 (4.3 4.9), 4.3 (4.1 4.6); maxillary tooth row
(C M3), 5.0 (4.8 5.1), 5.0 (4.8 5.2), 4.7 (4.6 4.8); maxillary breadth
at M3, 5.2 (5.1 5.4), 5.3 (5.1 5.5), 5.1 (4.8 5.2). [Illustration: FIG. 1. Left side of skull, incisors, canine, and
premolars × 11, and occlusal surface of left first upper molar × 20. A.
Myotis nigricans dalquesti , holotype. B... Continue reading book >>
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