Studies on the genus Onisimus Boeck, 1871 (Crustacea, Amphipoda, Uristidae) II. The barentsi and edwardsii groups Author Berge, Jørgen Author Vader, Wim Author Johnsen, Jan Roger text Zootaxa 2007 1410 55 68 journal article 10.5281/zenodo.175595 cfca74e8-b37b-4f49-b776-a1991a6659cc 1175-5326 175595 Species: Onisimus edwardsii Krøyer, 1846 . [monotypic] Remarks This group, consisting of just one species, is part of the larger group characterised by a cleft telson (see above), and is possibly a transitional taxon between the sextonae - and barentsi -groups: The peduncle of the first antenna is not produced anterodistally, thereby linking this group to the sextonae -group (see also Vader et al. 2005 ). However, the distomedial margin of the palp of the first maxilla is not serrate, thus separating this group from the barentsi -group (above). In addition, the telson of the species within this group is not as deeply cleft as in the two other groups. During our examination of North American Atlantic material of O. edwardsii , we discovered a previously undescribed taxon closely related to O. edwardsii . Due to lack of material, this new species will not be treated herein.