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.
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Acknowledgments
We are deeply indebted to Christian Wirkner (Universität Rostock, Germany) for help with the implementation of the 3D pdf. We thank Steffen Harzsch (Ernst-Moritz-Arndt-Universität Greifswald, Germany) who gave us the possibility to use the Amira 5.3 workstation. The first author thanks Gerd Alberti (Ernst-Moritz-Arndt-Universität Greifswald, Germany) for helpful discussion on the sperm structures of the RTA clade. The authors wish to thank Jason Dunlop (Museum für Naturkunde, Berlin, Germany) for improving the English and the anonymous reviewers for the helpful comments on the manuscript. Funding for this research was provided by the German Research Foundation to PM (DFG Mi 1255/5-1).
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Communicated by A. Schmidt-Rhaesa.
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435_2012_166_MOESM1_ESM.pdf
Computer-based 3D reconstruction visualizing the different cell components in a coiled sperm cell in the lumen of the testis. To be able to actively rotate and study the 3D-reconstruction, click on the picture. Use the mouse for navigation. To hide/show different structures, click the tree icon and select from the list. The image stack used for the 3D reconstruction is stored in MorphDBase (https://www.morphdbase.de?P_Michalik_20120706-M-2.1) (PDF 3614 kb)
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Michalik, P., Aisenberg, A., Postiglioni, R. et al. Spermatozoa and spermiogenesis of the wolf spider Schizocosa malitiosa (Lycosidae, Araneae) and its functional and phylogenetic implications. Zoomorphology 132, 11–21 (2013). https://doi.org/10.1007/s00435-012-0166-z
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DOI: https://doi.org/10.1007/s00435-012-0166-z