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Spermatogenesis in the urodele Amhystoma dumerilii
Author(s) -
Uribe M. C. A.,
Rios G. Gomez,
Brandon R. A.
Publication year - 1994
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1052220306
Subject(s) - biology , spermatogenesis , meiosis , neoteny , prophase , gametogenesis , chromatin , caudata , flagellum , germinal epithelium , zoology , sperm , reproductive cycle , microbiology and biotechnology , anatomy , ecology , reproduction , genetics , endocrinology , embryo , embryogenesis , dna , gene
The male reproductive cycle of this paedomorphic species that occurs only in Lake Pátzcuaro, Michoacán, México, was investigated by documenting changes in germinal cells during the spermatogenic cycle. Cysts of germ cells divide synchronously to complete spermatogenesis during September through December, with the proportion of evacuated cysts or cysts containing spermatozoa increasing during this period. The chromatin changes during prophase I of meiosis reveal the usual leptotene, zygotene, pachytene, and diplotene stages. A basal body at the caudal end of the spermatozoan head connects to the flagellum. After spermiation, empty cysts contain a granular substance. Spermatogenesis in this species follows an annual cycle like other north temperate salamanders, rather than the continuous spermatogenesis of some tropical salamanders. © 1994 Wiley‐Liss, Inc.