NDLI: Spermatozoa and spermiogenesis of the wolf spider Schizocosa malitiosa (Lycosidae, Araneae) and its functional and phylogenetic implications

Content Provider	Springer Nature Link
Author	Michalik, Peter Aisenberg, Anita Postiglioni, Rodrigo Lipke, Elisabeth
Copyright Year	2012
Abstract	The wolf spider Schizocosa malitiosa is a well-known model system for studies on sexual selection in spiders. Despite this, little is known about the morphology of the reproductive system and spermatozoa in this species. In the present study, we investigate the male genital system and sperm cells of S. malitiosa using electron microscopy and provide a computer-based 3D reconstruction of the spermatozoa for the first time for arthropods. In general, the male genital system consists of two long, tube-like testes that lead into convoluted deferent ducts. The ejaculatory duct is enlarged and contains a large quantity of sperm and secretion. As revealed by transmission electron microscopy, only one type of secretion droplet is present in the seminal fluid. The spermatozoa of S. malitiosa resemble an organization known for members of the RTA clade, i.e., with an arrow-shaped acrosomal vacuole partly sunk into the nucleus and a chambered centriolar adjunct (a newly introduced character). This organization provides further support for these characters as potential synapomorphies for the RTA clade. By the end of the spermiogenesis, the nucleus and axoneme coils within the cell and a multi-layered secretion sheath are formed representing cleistospermia. The function of the thick secretion sheath is still unknown, but might be correlated either with the residency time in the female (insemination until oviposition) since female S. malitiosa do not lay eggs before the fourth month after copulation or with the receptivity-inhibiting substances suggested for this species.
Starting Page	11
Ending Page	21
Page Count	11
File Format	PDF
ISSN	0720213X
Journal	Zoomorphology
Volume Number	132
Issue Number	1
e-ISSN	1432234X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Male reproductive system Secretion Phylogeny RTA clade Sexual selection Animal Anatomy / Morphology / Histology Developmental Biology Evolutionary Biology Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Developmental Biology Animal Science and Zoology

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