Jamieson B.G.M. auteur aut IRD Guinot D. auteur aut IRD Richer de Forges Bertrand auteur aut IRD text journalArticle eng text/pdf reformatted digital access Features of the spermatozoon of Calocarcinus africanus which are general for heterotremes and endorse its inclusion in the Heterotremata are : extension of the subacrosomal chamber almost to the anterior apex of the sperm, presence of an acrosome ray zone, and presence of a thickened ring where the capsule surrounds the base of the subacrosomal chamber. A feature shared with "higher" heterotremes is the restriction of cytoplasm to the periacrosomal region, the arms being nuclear only, in contrast with invasion of their chromatin with cytoplasm and microtubules in majids; and loss of a posterior median process, containing chromatin with cytoplasm and microtubules in majids; and loss of a posterior median process, containing chromatin, which is presend in majids as in raninids and homolids. (D'après résumé d'auteur) specialized TAXONOMIE ANATOMIE ANIMALE ULTRASTRUCTURE PHYLOGENIE CRUSTACE SPERMATOZOIDE NOUVELLE CALEDONIE 034BIOINV04 189-196 1993 0168-8170 https://www.documentation.ird.fr/hor/fdi:42808 0168-8170 [F B42808] https://www.documentation.ird.fr/hor/fdi:42808 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_37-38/42808.pdf IRD - Base Horizon / Pleins textes 1995-11-13 2006-05-27 fdi:42808 fre