Sperm morphology of two species of Olivancillaria (Gastropoda: Olividae) from the south-western Atlantic

• Published in: Journal of the Marine Biological Association of the United Kingdom
• Main Authors: Teso, Silvia Valeria, Giménez, Juliana
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press
• Subjects: Olividae; Sperm Ultrastructure; Reproduction; South Atlantic Ocean; https://purl.org/becyt/ford/1.6; https://purl.org/becyt/ford/1; Argentino; Argentina; Silvia
• Online Access: http://hdl.handle.net/11336/8428

Sperm ultrastructure in two species of the marine snail family Olividae is examined. Euspermatozoa of both species are com- posed of a conical, membrane-bound acrosomal vesicle; an axial rod and a basal plate similar in both species; a solid and highly electron-dense nucleus; an elongate midpiece consisting of the axoneme sheathed by helical mitochondrial elements; an elongate glycogen piece; a double electron-dense ring at the junction of the midpiece and glycogen piece; and a free tail region. The slight narrowing in the acrosomal vesicle invagination is situated in different levels between Olivancillaria deshayesiana and Olivancillaria carcellesi. This morphology could be considered as a specific character. The length of the nucleus in O. carcellesi and in O. deshayesiana is shorter than that of other neogastropods, and could be diagnostic at family level. Fil: Teso, Silvia Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina Fil: Giménez, Juliana. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biologia Experimental y Aplicada; Argentina