caa a22 4500 463255097 CHVBK 20180405153352.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s00435-006-0026-9 doi (NATIONALLICENCE)springer-10.1007/s00435-006-0026-9 Genital system development of Williamia radiata (Gastropoda, Siphonariidae) [Elektronische Daten] [B. Ruthensteiner, E. Lodde, S. Schopf] 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 0.7mm 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. Springer-Verlag, 2006 Genital system nationallicence Development nationallicence Pulmonata nationallicence Williamia nationallicence Ruthensteiner B. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany aut Lodde E. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany aut Schopf S. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany aut Zoomorphology Springer-Verlag 126/1(2007-04-01), 17-29 0720-213X 126:1<17 2007 126 435 https://doi.org/10.1007/s00435-006-0026-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00435-006-0026-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ruthensteiner B. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany aut NATIONALLICENCE 700 1- Lodde E. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany aut NATIONALLICENCE 700 1- Schopf S. Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247, Munich, Germany aut NATIONALLICENCE 773 0- Zoomorphology Springer-Verlag 126/1(2007-04-01), 17-29 0720-213X 126:1<17 2007 126 435 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer