Jamieson B.G.M., Guinot D., Richer de Forges Bertrand. (1994). Relationships of the Cyclodorippoidea Ortmann : evidence from spermatozoal ultrastructure in the genera Xeinostoma, Tymolus and Cymonomus (Crustacea, Decapoda). Invertebrate Reproduction and Development, 26 (2), p. 153-164.
Titre du document
Relationships of the Cyclodorippoidea Ortmann : evidence from spermatozoal ultrastructure in the genera Xeinostoma, Tymolus and Cymonomus (Crustacea, Decapoda)
Année de publication
1994
Type de document
Article
Auteurs
Jamieson B.G.M., Guinot D., Richer de Forges Bertrand
Source
Invertebrate Reproduction and Development, 1994,
26 (2), p. 153-164
The spermatozoa of two genera and species of Cyclodorippidea, Xeinostoma richeri (Xeinostomidae) and Tymolus sp. (Cyclodorippinae), and one species of Cymonomus sp. (Cymonomidae) are found to constitute a distinctive cyclodorippoid sperm-type characterized by (1) sperm anteroposteriorly depressed, mean ratio of lenght to width 0.54-0.63; (2) operculum extending to the lateral limits of the acrosome (autapormorphy of cyclodorippoids) and centrally perforate or (Cymonomus sp.) thinner; (3) contents of acrosome vesicle with two major horizontal zones, as in homolids and dynomenids, including a dese lower (posterior) zone; (4) perforatorium very wide (0.3 width of acrosome) anteriorly rounded, not capitate, lacking radiate projections; (5) acrosomal capsule with external projections over its posterio half; (6) slender dense filaments extending into the perforatorium from its walls, their bases associated with corrugations of its basal wall; (7) nucleus, cupping the acrosome and cytoplasm, with well-developed posterior median process; (8) nuclear arms lacking microtubules; (9) cytoplasm, a narrow postacrosomal band extending anteriorly as far as the operculum, associated with a few degenerate mitochondria. (D'après résumé d'auteur)
