Podotreme affinities of Raninoides sp. and Lyreidus brevifrons : evidence from spermatozoal ultrastructure (Crustacea : Brachyura : Raninoidea) Jamieson, B.G.M. Guinot, D. /Richer de Forges, Bertrand TAXONOMIE ANATOMIE ANIMALE ULTRASTRUCTURE CRUSTACE SPERMATOZOIDE 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) 1994 text https://www.documentation.ird.fr/hor/fdi:42807 fdi:42807 Jamieson B.G.M., Guinot D., Richer de Forges Bertrand. Podotreme affinities of Raninoides sp. and Lyreidus brevifrons : evidence from spermatozoal ultrastructure (Crustacea : Brachyura : Raninoidea). 1994, 239-249 EN NOUVELLE CALEDONIE