The Genus Bathyporeia Lindstrom, 1855, in Western Europe (Crustacea: Amphipoda: Pontoporeiidae)

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Revised and new identification keys are provided. The importance of new characters such as the morphology of the first uropod is stressed. Eight species are redescribed and illustrated. It has been observed for the first time that all species of the genus exhibit an unusual sexual dimorphism on the mandibular palp: in the adult males, the ventral border of the terminal article has a comb of stiff setae which is lacking in females and immature males. Furthermore, a locking system holding together the inner plates of the maxilliped is described and illustrated.