Waldeckia obesa Chevreux 1905

• Main Authors: Lowry, J. K., Kilgallen, N. M.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Lysianassidae; Waldeckia; Waldeckia obesa; Antarctic; Lowry; Chevreux; Anvers; Anvers Island; Biscoe; Palmer Archipelago; Booth Island; Biscoe Bay; Antarc*; Antarctica; ren
• Online Access: https://zenodo.org/record/5316434; https://doi.org/10.5281/zenodo.5316434

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. Published as part of Lowry, J. K. & Kilgallen, N. M., 2014, A revision of the lysianassid genus Waldeckia with the description of four new species (Crustacea, Amphipoda, ...