Females frequently mate with several males, whose sperm then compete to fertilize
available ova. Sperm competition represents a potent selective force that is expected to …

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

Mammalian sperm must spend a minimum period of time within a female reproductive tract
to achieve the capacity to fertilize oocytes. This phenomenon, termed sperm 'capacitation' …

Sperm are often considered to be individuals, in part because of their unique genetic
identities produced as a result of synapsis during meiosis, and in part due to their unique …

Plutella xylostella exhibits exceptional reproduction ability, yet the genetic basis underlying
the high reproductive capacity remains unknown. Here, we demonstrate that an orphan …

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Spermatozoa may occur as physical aggregates of two or more cells, which is an array that
frequently occurs in Adephaga. We investigated the spermatozoa of Gyretes sp. using light …

Relatively few studies have focused on evolutionary losses of sexually selected male traits.
We use light and electron microscopy to study the male and female reproductive anatomy of …

Based on advanced light and electron microscopy, we describe the male reproductive
system and sperm development of Limodromus assimilis. The genital tract consists of pairs …

The systematic position and the phylogenetic relationship of Rhysodidae members is still
debated, with some authors considering the group as a separate family of Adephaga, while …