We examined the testicular histology of 32 adult male Pseudobranchus axanthus collected at Rainey Slough (Glades County), Florida, during 1974–76. The process of spermatogenesis was evident throughout all regions of the testes and appeared to occur year-round. The testes contain numerous, spherical-to-oblong testicular lobules that vary greatly in size. Unlike all other salamanders, which exhibit cystic spermatogenesis along with a caudo-cephalic wave of maturing cell types (leading to spatial and temporal segregation of germ cells), spermatogenesis in P. axanthus lacks testicular cysts. Instead, the testicular lobules possess an assortment of different spermatogenic cell stages, all arising from primary spermatogonia through mitotic and meiotic divisions, thus creating a germ cell/Sertoli cell syncytium along the lobular epithelium. Secondary spermatocytes then detach from the lobular epithelium and from their accompanying Sertoli cells and undergo spermiogenesis within the lumen. We propose naming this new type of germ cell development non-cystic lobular spermatogenesis. Upon maturation, sperm travel from the lobular lumen into a longitudinal testicular canal via an intratesticular duct. The testicular canal conveys sperm to about 15 vasa efferentia, which then connect to genital renal capsules. Sperm move through the renal tubules and eventually reach the Wollfian duct. This duct transports sperm to the cloaca.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 105 • No. 4