The sperm glycocalyx of Pezotettix giornai (Rossi) (Insecta: Orthoptera) after quick-freeze, deep-etching.
ABSTRACT Mature spermatozoa of the catantopid orthopteran Pezotettix giornai are characterized by an elaborate external glycocalyx. This coating is removed during storage in spermatheca allowing preparation of sperm to their interaction with female gametes. We have studied this membrane coating in mature sperm by both conventional transmission electron microscopy and quick-freeze, deep-etching. The ultrastructural studies allowed visualization of three different domains in glycocalyx of testicular and deferent duct spermatozoa and only two in sperm cell isolated from seminal vesicles. These observations thus demonstrate that a remodeling of the male germ cell starts already during their storage in the seminal vesicle and is completed in the female genital tract. In this paper a three-dimensional (3D) model of sperm external coating is presented and discussed.
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ABSTRACT: The main characteristics of the sperm structure of Hexapoda are reported in the review. Data are dealing with the process of spermatogenesis, including the aberrant models giving rise to a reduced number of sperm cells. The sperm heteromorphism and the giant sperm exceeding the usual sperm size for length and width are considered. The characteristics of several components of a typical insect sperm are described: the plasma membrane and its glycocalyx, the nucleus, the centriole region and the centriole adjunct, the accessory bodies, the mitochondrial derivatives and the flagellar axoneme. Finally, a detailed description of the main sperm features of each hexapodan group is given with emphasis on the flagellar components considered to have great importance in phylogenetic considerations. This study may be also useful to those requiring an introduction to hexapod reproduction.Arthropod structure & development 04/2014; · 1.11 Impact Factor