The Cumacea (Crustacea: Peracarida) from a North Atlantic Transect with RV "Sonne" with the description of ten new species.

In total 36 species were identified, from the abyssal of the Vema Fracture Zone in the tropical northern Atlantic and the Puerto Rico Trench, including ten new species. The new species are Chalarostylis erebos n. sp., Chalarostylis nyx n. sp. (Lampropidae), Bathycuma sonneae n. sp. (Bodotriidae), Leucon (Crymoleucn) fracturensis n. sp., Leucon (Crymoleucon) marinae n. sp., Leucon (Macrauloleucon) longiserratus n. sp., Leucon (Macrauloleucon) breviserratus n. sp. (Leuconidae), Atlantistylis paraborealis n.sp., Leptostylis abyssalis n. sp. and Leptostylis danieli n. sp. (Diastylidae).

Selected species of the family Diastylidae (Cumacea, Peracarida, Crustacea) from the deep-sea of the NW Pacific.

New species of the genera Diastylis, Divacuma and Leptostylis are described. Also a new species of the genus Pseudoleptostyloides, known from the Atlantic, is described for the NW Pacific. Additional information is given on Leptostyloides quadridentata.

Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic.

Nine species of the family Diastylidae, two species of the family Bodotriidae and one species of the family Pseudocumatidae are present in the Diva II and Ifremer collections. Two new species were recognized and described herein. However, one of the new species has to remain in open nomenclature due to its young developmental stage. The new species are Makrokylindrus (Makrokylindrus) abyssalis, and M. (Adiastylis) sp.1. The distribution range is enlarged based on the new findings for seven species.

Remarks on the deep-sea genus Chalarostylis (Cumacea: Lampropidae).

Chalarostylis is a deep-sea genus close to Hemilamprops but easily distinguished from the latter mainly by its robust first pereopod. However, this appendage is frequently broken off at the anterior margin of the basis, making the identification of the species of the genus difficult. Regarding Hemilamprops brenkei, both the adult male holotype and the additional specimens herein reported from the Weddell Sea and the Guinea, Argentine and Brazilian Basins exhibit a huge first pereopod. Thus, this species is transferred to Chalarostylis and its description completed. Two other species until now in Hemilamprops, H. canadensis and H. longisetae are also transferred to Chalarostylis. In addition, an unknown species of Chalarostylis from the Bay of Biscay for which no name is given is briefly described. The diagnosis of this genus is emended.