Pseudonesimus tacitus (J.L. Barnard, 1961 ) Kilgallen & Lowry, 2014

Kilgallen, N. M. & Lowry, J. K., 2014, The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae), Zootaxa 3768 (5), pp. 501-545 : 516

Pseudonesimus tacitus (J.L. Barnard, 1961) comb. nov.

( Fig. 9 )

Aristiopsis tacitus J.L. Barnard, 1961: 31 , fig. 2.?—J.L. Barnard, 1964: 4, fig. 1.

? Aristiopsis tacita .—J.L. Barnard, 1967: 53, fig. 22.

Types. Holotype, female, 7 mm. ZMUC CRU-8336 .

Type locality. Tasman Sea (44º18'S 166º46'E), 3580 m, clay .

Habitat. Marine clay.

Depth range. 791–3580 m (J.L. Barnard 1961, 1967).

Remarks. This species was originally recorded from the Tasman Sea just off the coast of the south island of New Zealand. It has since been recorded from the west coast of North America in the Cedros Trench and the Gulf of Panama ( Barnard 1964, 1967). Morphologically, both North American populations recorded correspond closely with the Tasman Sea population; however specimens collected from the Panama Trench have a larger dactylus on gnathopod 2 than those from the Tasman Sea, while those from the Cedros Trench have a shorter, stouter maxilliped palp.

Distribution. South Pacific Ocean. Tasman Sea (44º18'S 166º46'E) (J.L. Barnard 1961). North Pacific Ocean. Gulf of Panama (J.L. Barnard 1964); Cedros Trench (J.L. Barnard 1967).

Figures

FIGURE 9. Pseudonesimus tacitus (J.L. Barnard, 1961), holotype, female, 7mm, ZMUC CRU-8336, Tasman Sea. Habitus after J.L. Barnard, 1961. Scale bars: MX1, MX2, 0.1 mm; remainder, 0.2 mm.