Jamieson B.G.M., Guinot D., Richer de Forges Bertrand. (1994). Podotreme affinities of Raninoides sp. and Lyreidus brevifrons : evidence from spermatozoal ultrastructure (Crustacea : Brachyura : Raninoidea). Marine Biology, p. 239-249. ISSN 0025-3162.
Titre du document
Podotreme affinities of Raninoides sp. and Lyreidus brevifrons : evidence from spermatozoal ultrastructure (Crustacea : Brachyura : Raninoidea)
Année de publication
1994
Type de document
Article
Auteurs
Jamieson B.G.M., Guinot D., Richer de Forges Bertrand
Source
Marine Biology, 1994,
p. 239-249 ISSN 0025-3162
Spermatozoal synapomorphies which singly or collectively distinguish Raninoidea are : (1) the presence of single (Ranina), Raninoides) or multiple (Lyreidus) keel-like projections of the acrosomal zone (Ranina, Raninoides) and an homologous large outer zone in Lyreidus; (3) poor differentiation of the operculum from the capsule (autapomorphy); (4) a very well developed, perforate subopercular zone, of variable form; (5) presence of unique inward longitudinal projections (septa or corrugations) in the wall of the subacrosomal chamber (autapomorphy). Shared, presumably synapomorphic characters of Ranina and Raninoides but not of Lyreidus within the Raninidae, are (1) branching of some of the subacrosomal septa (unbranched in Lyreidus); (2) the subspheroidal form of the acrosome in Ranina with a lenth : width ratio (L:W) of O.76, and, although slightly more depressed form in Lyreidus (L:W 0.52). (D'après résumé d'auteur)
