Waldeckia nudum ( Imbach, 1967 )

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

Waldeckia nudum ( Imbach, 1967)

( Fig. 25 b)

Lepidepecreum nudum Imbach, 1967: 53 , pl. 1. ― Barnard & Karaman, 1991: 496. Waldeckia elephas Hirayama & Kikuchi, 1980: 151 , figs 1–5. ― Hirayama, 1985: 192. ― Barnard & Karaman, 1991: 542. Waldeckia nudum . ― Lowry, 2000: 322.

? Waldeckia australiensis . ― Ren, 2012: 174, fig. 76.

Types. Holotype, male, 10 mm, ZMUC CRU-7569.

Type locality. Off Nhatrang, Vietnam (12°16.91'N, 109°16.88'E), 18/03/1960, 17 m, coarse brown sand ( NAGA Stn 256).

Material examined. 20 specimens, AM P.92567 and 20 specimens, RMBR, SS- 3498 (SW-137) between St Johns and Lazarus Islands, Singapore, baited trap, 25 m depth, N. Bruce & J.K. Lowry, 31 May 2013. 3 specimens, AM P.92568, north-west of Koh Phayam, Andaman Sea (approximately 09°47'49.3"N 98°22'52.3"E) coll. Montri Sumontha, 15 August 2013.

Diagnostic description. Head lateral cephalic lobe large, broad, subacute. Antenna 1 peduncular article 1 without anterodistal projection. Labrum, epistome and upper lip fused. Mandible palp article 2 anterodistal margin setose; article 3 with marginal and apical setae. Labium, apical stylets not known. Gnathopod 1 parachelate; basis with slender setae; propodus posterior margin smooth. Gnathopod 2 minutely chelate; carpus long; palm minute, obtuse; dactylus fitting palm. Pereopod 6 basis posteroventral margin rounded. Pereopod 7 basis, slightly rounded, minutely crenate, posteroventral margin oblique. Epimeron 3 posteroventral corner narrowly rounded. Urosomites 1–3 dorsally smooth. Uropod 1 rami subequal in length; uropod 2 rami subequal in length; uropod 3 rami subequal in length, inner ramus reaching article 2 of outer ramus.

Depth range. 17– 25 m.

Remarks. Imbach (1967) originally described W. nudum in the genus Lepidepecreum . When Hirayama & Kikuchi (1980) described W. elephas they did not consider W. nudum . We think that the type of W. nudum is not fully mature (the mandibular palp is weakly setose in comparison to the type of W. elephas ), and is a senior synonym of W. elephas . Waldeckia nudum differs from other species in the genus in the smooth posterior margin of the gnathopod 1 propodus in combination with the minutely chelate gnathopod 2 and the oblique posteroventral margin of the basis of pereopod 7.

Distribution. Japan: Tomioka Bay. Vietnam: Nhatrang. Singapore: Singapore Straits. Thailand: Koh Phang, Andaman Sea.

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.