Variation in sexual traits within and among species arises from past and current biotic and
abiotic selective regimes, environmental conditions experienced during ontogeny, and …

Spermiogenesis in the soft‐shelled turtle, Pelodiscus sinensis, was examined by
transmission electron microscopy. The process includes nuclear elongation, chromatin …

We studied the spermiogenesis and testicular cycle of the lizard Tropidurus torquatus, using
light and electron microscopy. Males bearing spermatozoa were present practically year …

Objective—To determine an efficient method for the collection of semen samples by means
of electroejaculation, characterize spermatozoa quality and quantity, and determine the …

Spermatogenesis, the remarkable process of morphological and biochemical transformation
and cell division of diploid stem cells into haploid elongated spermatozoa, is one of the most …

We conducted partitioned and combined Bayesian and parsimony phylogenetic analyses of
corytophanid lizards (Iguania) using mtDNA, gross morphology, and sperm ultrastructure …

The spermatozoon of Iguana iguana is filiform and resembles that of other iguanian lizards,
being most similar to Tropidurus. All sperm synapomorphies of Tetrapoda, Amniota and …

Sperm ultrastructure has been described for several families of Squamata in which it has
been considered a valuable character source for phylogenetic studies. However, sperm …

The intent of this chapter is to review the major morphological data on the architecture of the
testis, the histological ontogeny of spermatogenesis, and the ultrastructure of the mature …

Spermatogenesis, with emphasis on spermiogenesis, is described for the lizard, Tropidurus
itambere, using light microscopy, phase contrast and epifluorescence, as well as scanning …