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Reproduction of the Texas Horned Lizard, Phrynosoma cornutum

Royce E. Ballinger
Herpetologica
Vol. 30, No. 4 (Dec., 1974), pp. 321-327
Published by: Allen Press on behalf of the Herpetologists' League
Stable URL: http://www.jstor.org/stable/3891426
Page Count: 7
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Reproduction of the Texas Horned Lizard, Phrynosoma cornutum
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Abstract

The reproductive cycle of the Texas horned lizard, Phrynosoma cornutum at San Angelo, Texas was determined from examination of 116 ♀ ♀ and 48 ♂ ♂. During 1968 and 1969, reproduction began in April and ceased during mid-July. Females apparently do not mature until their second season after birth at a size of about 70 mm snout-vent length. It appears a single clutch averaging 29 eggs is produced each year. No geographic variation in clutch size was evident upon examination of 96 additional specimens from North to South Texas and East Texas to eastern Arizona.

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