Publisher Summary This chapter reviews the current knowledge of variation in sperm
morphology over several levels of biological organization: variation within males (both within …

Until recently, the histology and ultrastructural events of spermatogenesis in reptiles were
relatively unknown. Most of the available morphological information focuses on specific …

Knowing whether triploid hybrids resulting from natural hybridization of parthenogenetic and
bisexual species are fertile is crucial for understanding the mechanisms of reticulate …

The ultrastructure of snake sperm has received substantial attention primarily because
snakes exhibit considerable variability in reproductive characteristics between species, with …

This chapter is intended to cover morphological data on the testis, spermatogenesis,
ultrastructure of spermiogenesis, and the mature spermatozoon in snakes. Though it would …

Current knowledge on avian spermiogenesis, including strengths and weaknesses, has
been reviewed. Information on avian spermiogenesis considerably lags behind that in …

Of the 934 lizard species evaluated by the International Union for the Conservation of Nature
(IUCN), at least one-third is threatened with extinction. However, there are no reports of …

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

The ultrastructure of spermatozoa in cauda epididymidis of soft-shelled turtle, P. sinensis
during breeding season was investigated by light microscopy (LM) and electron microscopy …

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