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Genital system development of Williamia radiata (Gastropoda, Siphonariidae)

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Abstract

The adult anatomy and development of the genital system of the limpet Williamia radiata (Siphonariidae, Gastropoda) was investigated by means of 3D computer reconstruction and visualization of serial resin and paraplast light microscopical sections. As is characteristic for siphonariid species, the adult genital system consists of a single duct, the spermoviduct leading from the nidamental glandular system to the anteriorly located genital atrium with opening. The copulatory complex as well as the bursa copulatrix also open into the common genital atrium. The genital system develops from three separate anlagen. The posterior one appears first at a body length of 0.7 mm and gives rise to the ovotestis and part of the hermaphrodite duct. The nidamental glandular complex, the fertilization pouch-spermatheca complex, part of the hermaphrodite duct, the posterior part of the spermoviduct, and the bursa copulatrix develop later from the pallial anlage. Finally, the anterior anlage is formed on the right side of the head and gives rise to the genital atrium, the copulatory complex, and the anterior spermoviduct. This formation of the genital system from three, locally separated anlagen, differs strikingly from that of most other species of the Euthyneura. In both the Nudibranchia (Opisthobranchia) and the Stylommatophora (Pulmonata) development proceeds from a single site. We regarded this as a secondary condition as a result of derived features like heterochronies in development in these taxa. Comparison of development with that of other species of the Pulmonata allows conclusions on homology. The homology of the bursa copulatrix within the pulmonates is confirmed. The two separate chambers inside the spermoviduct of W. radiata correspond to oviduct and vas deferens of the freshwater Basommatophora.

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Acknowledgements

We wish to express our gratitude to Christian Brossmann (Leibnitz-Rechenzentrum, Munich) and staff of the Konrad-Zuse-Zentrum (Berlin) for help with the Amira software. Martin Spies (ZSM, Munich) helped to improve the English text.

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  1. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany

    B. Ruthensteiner, E. Lodde & S. Schopf

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  1. B. Ruthensteiner
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  2. E. Lodde
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  3. S. Schopf
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Correspondence to B. Ruthensteiner.

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Ruthensteiner, B., Lodde, E. & Schopf, S. Genital system development of Williamia radiata (Gastropoda, Siphonariidae). Zoomorphology 126, 17–29 (2007). https://doi.org/10.1007/s00435-006-0026-9

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  • DOI: https://doi.org/10.1007/s00435-006-0026-9

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