Thrombasia tracalero J.L. Barnard, 1966

Kilgallen, N. M. & Lowry, J. K., 2014, The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae), Zootaxa 3768 (5), pp. 501-545 : 530-534

Thrombasia tracalero J.L. Barnard, 1966

( Fig. 20 )

Thrombasia tracalero J.L. Barnard, 1966: 73 , figs 23, 24.

Schisturella tracalero .― Barnard & Karaman, 1991: 527.― Larsen, 2007: 14 (key).

Schisturella totorami J.L. Barnard, 1967: 72 (key), 78, figs 36, 37.― Larsen, 2007: 14 (key).

Types. Holotype, male, 4.5 mm, LACM CR 1954 - 054.1 (originally AHF 2789 ).

Type locality. Slope of Santa Monica Basin (33º49'59"N 118º34'05"W), 167 m.

Feeding strategy. Scavenger (from a hagfish trap) (J.L. Barnard 1967).

Depth range. 167–183 m (J.L. Barnard 1966, 1967).

Remarks. We consider Schisturella totorami to be a junior subjective synonym of Thrombasia tracalero . Both species share the same general type locality (Santa Monica Bay (167–183 m )). The only apparent difference noted from the original descriptions is that the uropod 3 rami of Schisturella totorami are strongly lined with plumose setae, whereas that of the holotype of T. tracalero is not. However, the T. tracalero holotype is probably an immature specimen.

The mandibular molar of Thrombasia tracalero is asymmetrical, proximally setose and distally triturating and thus differs from all other members of the genus that have a columnar molar with oval fully triturating surface.

Distribution. East Pacific Ocean. Santa Monica Basin, California, USA (J.L. Barnard 1966, 1967).

Figures

FIGURE 20. Thrombasia tracalero J.L. Barnard, 1966, holotype male, 4.5 mm, LACM CR 1954-054.1, from Santa Monica Basin, eastern Pacific Ocean. Habitus, E, MX2 after J.L. Barnard, 1966. Scale bars: gnathopods, pereopods, 0.2 mm; remainder, 0.1 mm.