Waldeckia obesa ( Chevreux, 1905 )

Lowry, J. K. & Kilgallen, N. M., 2014, A revision of the lysianassid genus Waldeckia with the description of four new species (Crustacea, Amphipoda, Lysianassidae, Waldeckiinae subfam. nov.), Zootaxa 3784 (4), pp. 301-345 : 332-333

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.

Figures

FIGURE 25. Distribution records for Waldeckia spp. Stars indicate type locality. (a) W. nitens (Haswell, 1879 a), (b) W. nudum (Imbach, 1967), (c) W. obesa (Chevreux, 1905), (d) W. orchospina (Hirayama, 1986), (e) W. selayarensis sp. nov., (f) W. tangaroa sp. nov.