L’évolution du genre Jaera Leach (Isopodes; Asellotes) et ses rapports avec l’histoire de la Méditerranée

The genus Jaera includes 19 species or subspecies, mostly endemic to Europe. The new forms J. nordmanni nordmanni, J. n. occidentalis, Jaera istri, and J. n. illyrica are described. The phylogeny of this group can be inferred. The cladogenetic events leading to its differentiation appear closely correlated to the origin of the Mediterranean basin and to the glacial periods.