Waldeckia obesa (Chevreux, 1905)

(Fig. 25 c)

Charcotia obesa Chevreux, 1905: 163, fig. 3 (see De Broyer et al. (2007) for comprehensive synonymy and distribution). Orchomene arnaudi Bellan-Santini, 1972: 205, fig. 22.

Waldeckia robusta Ren & Huang, 1991: 255, 310, figs 44, 45.

Types. MNHN.

Type locality. Palmer Archipelago, Antarctica: Anvers Island, Biscoe Bay (64°50.0’S, 110 m) and Booth Island.

Diagnostic description. Head lateral cephalic lobe large, broad, subacute. Antenna 1 peduncular article 1 without anterodistal projection. Labrum, epistome and upper lip separate. Mandible palp article 2 anterodistal margin setose; article 3 with marginal and apical setae. Labium without apical stylets on each lobe. Gnathopod 1 parachelate; basis anterior margin with slender setae; propodus posterior margin smooth. Gnathopod 2 minutely subchelate; carpus long; propodus palm transverse, dactylus fitting palm. Pereopod 6 basis posteroventral margin rounded. Pereopod 7 basis, posterior margin almost straight, smooth, posteroventral margin rounded. Epimeron 3 posterior margin with strong spine above rounded posteroventral corner. Urosomite 1 with small dorsodistal acute spine. Uropod 1 outer ramus slightly longer than inner ramus; uropod 2 outer ramus slightly longer than inner ramus; uropod 3 inner ramus shorter than outer ramus, reaching article 2 of outer ramus.

Depth range. 0–1030 m.

Remarks. De Broyer et al. (2007) considered W. arnaudi (Bellan-Santini, 1972) and W. robusta Ren & Huang, 1991 to be a juveniles of W. obesa . We accept this decision. Waldeckia obesa differs from all other species (except W. tangaroa sp. nov.) in having a labrum with separate epistome and upper lip. It also differs from all other species of Waldeckia in having a strong spine above rounded posteroventral corner of epimeron 3. Distribution. Circum-Antarctic.