The genera Centris and Epicharis constitute the Centridini and are widely distributed in the
Neotropical region. Centris is also found in the southern portion of the Neartic region …

Giant water bugs (Belostomatidae) are widespread in the tropical and subtropical regions
and have important ecosystem functions. This study describes the structure of the male …

We investigated the male and female reproductive tracts of Gyretes sp. with light and
transmission electron microscopies. The male has a pair of testes with a single coiled …

The formation and structure of sperm bundles (spermiozeugmata), and the structure of the
vas deferens where bundles are formed, in Pterostichus nigrita is described by light and …

Variations in the adult male reproductive system among different groups of Hymenoptera
offer characteristics that help studies on behavior and phylogenetics. The objective of this …

The three Pegoscapus species present the same internal reproductive tract features
comprising testes with a single testicular tubule, seminal vesicles, vasa deferentia …

Male fitness depends on the number of lifetime progeny of their mates and could be
constrained by the chance of finding a mate, lifespan and temporal patterns of sperm …

Despite the biological importance of Meliponini bees, there are still many doubts about their
reproductive physiology and phylogeny. When compared with other bee species studied up …

The male reproductive system of Mischocyttarus cassununga consists of two testes, each
one with three follicles, as occurs in most Vespidae. The seminal vesicle is divided in two …

Variation in the morphology of the adult male reproductive system among different groups of
Hymenoptera offer characteristics that help studies of behavior and the evolutionary history …