Sex, seminal receptacles, and sperm ultrastructure in the commensal bivalve Montacuta phascolionis (Veneroida; Galeommatacea)

Authors: Jespersen, Åse¹; Lützen, Jørgen¹

Source: Acta Zoologica, Volume 81, Number 1, February 2000 , pp. 69-75(7)

Publisher: Blackwell Publishing

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Abstract:

It is argued that the paired structures in adult Montacuta phascolionis previously claimed to be testes are seminal receptacles. The receptacles in 3.0mm long females are filled with sperm cells or spermatids. A 2.0-mm long specimen had a well-developed testes exhibiting ripe sperm. It is concluded that the species is a protandrous hermaphrodite and that the previously described dwarf males are rather complemental males. The ultrastructure of the sperm cells is described and compared with that of the sperm of related species.

Document Type: Research article

DOI: 10.1046/j.1463-6395.2000.00040.x

Affiliations: 1: Department of Zoomorphology, Institute of Zoology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ò, Denmark, bivalve, Montacuta phascolionis, seminal receptacle, sperm ultrastructure

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