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Seasonal Testicular Histology of the Colubrid Snakes, Masticophis taeniatus and Pituophis melanoleucus
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Seasonal Testicular Histology of the Colubrid Snakes, Masticophis taeniatus and Pituophis melanoleucus

著者: Stephen R Goldberg; William S Parker
版本/格式: 文章 文章 : 英语
刊登在:Herpetologica, Sep., 1975, vol. 31, no. 3, p. 317-322
数据库:JSTOR
提要:
Testicular cycles of the colubrid snakes, Masticophis taeniatus and Pituophis melanoleucus are described. Testes are regressed April-May; recrudescence begins in June. Spermiogenesis occurs in both species during late summer-early autumn. ♂ ♂ emerge from hibernation in April with sperm from the previous autumn stored in the epididymis and ductus deferens. Breeding activity commences in April and continues into early  再读一些...
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文件类型: 文章
所有的著者/提供者: Stephen R Goldberg; William S Parker
ISSN:0018-0831
OCLC号码: 485214334
语言注释: English
注意: Fig. 1.-Seminiferous tubules of Masticophis taeniatus and Pituophis melanoleucus. (A) 29 April, spermatogonia and Sertoli cells present, 250×. (B) 8 April, epididymis partially filled with sperm, 160×. (C) 22 April, ductus deferens packed with sperm, 160×. (D) 5 July, recrudescence in progress, primary, secondary spermatocytes and undifferentiated spermatids present, 400×. (E) 11 September, spermiogenesis; note sperm tails projecting into lumen, 250×. (F) 14 October, regressing testis; germinal epithelium reduced to one to two layers, 250×. (D) from P. melanoleucus, all others M. taeniatus.
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摘要:

Testicular cycles of the colubrid snakes, Masticophis taeniatus and Pituophis melanoleucus are described. Testes are regressed April-May; recrudescence begins in June. Spermiogenesis occurs in both species during late summer-early autumn. ♂ ♂ emerge from hibernation in April with sperm from the previous autumn stored in the epididymis and ductus deferens. Breeding activity commences in April and continues into early summer. Sperm is present in the ductus deferens throughout the year. Interstitial cell nuclei diameters are at maximum sizes during autumn and spring. Minimum sizes were recorded in summer.

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