THE NAUTILUS 123(3):166–171, 2009 Page 166 Sperm morphology of two marine neogastropods from the southwestern Atlantic Ocean (Caenogastropoda: Volutidae and Olividae) Juliana Gime´nez Florencia Arrighetti Valeria Teso CONICET, Laboratorio de CONICET, Laboratorio de CONICET, Museo Argentino de Invertebrados, DBBE Invertebrados, DBBE Ciencias Naturales Facultad de Ciencias Exactas y Naturales Facultad de Ciencias Exactas y Naturales Buenos Aires, ARGENTINA Universidad de Buenos Aires Universidad de Buenos Aires. Buenos Aires, ARGENTINA Buenos Aires, ARGENTINA
[email protected] and CONICET, Museo Argentino de Ciencias Naturales Buenos Aires, ARGENTINA Gladys N. Hermida Soledad Zabala Pablo E. Penchaszadeh Laboratorio de Histologı´a Animal, DBBE CONICET, Laboratorio de CONICET, Laboratorio de Facultad de Ciencias Exactas y Naturales Invertebrados, DBBE Invertebrados, DBBE Universidad de Buenos Aires Facultad de Ciencias Exactas y Naturales Facultad de Ciencias Exactas y Naturales Buenos Aires, ARGENTINA Universidad de Buenos Aires Universidad de Buenos Aires Buenos Aires, ARGENTINA Buenos Aires, ARGENTINA and CONICET, Museo Argentino de Ciencias Naturales Buenos Aires, ARGENTINA ABSTRACT toms in coastal waters of the southern hemisphere, although the family has a global distribution and extends The testes of Caenogastropoda typically produce two types of to bathyal and abyssal depths (Clench and Turner, 1970; spermatozoa, euspermatozoa and paraspermatozoa. The struc- Poppe and Goto, 1992). More than 200 species are tures of both morphological forms of sperm contribute to our understanding of reproductive biology, and also have been known, with shells that vary substantially in shape and useful to elucidate taxonomic and phylogenetic relationships size. Fourteen species of Volutidae are reported from among gastropods. This article describes the ultrastructure the southwestern Atlantic Ocean, including members of and the possible importance for systematics of the eusperma- the genus Adelomelon (Rios, 1994).