Tasmanosa, Lowry & Kilgallen, 2014

Lowry, J. K. & Kilgallen, N. M., 2014, New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae), Zootaxa 3844 (1), pp. 1-64 : 44

Tasmanosa gen. nov.

Type species. Tasmanosa tasman sp. nov., by present designation.

Included species. Tasmanosa includes two species: T. tasman sp. nov.; T. toogooloo sp. nov.

Etymology. A reference to the Tasman Sea.

Diagnostic description. Antenna 1 peduncular article 1 without anterodistal projections; accessory flagellum not forming operculum. Antenna 2 peduncle article 5 not enlarged, with weak brush setae on the anterior margin in male. Mandibular incisor curved; molar an asymmetric column, proximally setose, distally triturating; palp attached midway. Maxilla 1 ST-7 slender, serrate along most of medial margin; ST-D slender, serrate along most of medial margin. Maxilliped outer plate apical setae present. Gnathopod 1 subchelate; coxa large about as long as coxa 2, slightly tapering distally; ischium short; carpus shorter than propodus; propodus posterior margin densely setose. Pereopod 4 coxa with well developed posteroventral lobe. Uropod 2 inner ramus not constricted. Uropod 3 rami with or without plumose setae. Telson deeply cleft.

Remarks. Tasmanosa gen. nov. is similar to Coximedon Barnard & Karaman, 1991 , but does not display the broadened gnathopod 1 propodus characteristic of that genus. The setal-teeth are much more finely serrate and the robust setae on the medial margin of the maxilliped outer plate more strongly developed in Tasmanosa . Additionally, the gnathopod 1 propodus of Tasmanosa has a dense brush of long setae, while that of Coximedon only has sparse, short setae.

Tasmanosa differs from Tryphosella Bonnier, 1893 , in having a longer and more weakly tapering gnathopod 1 coxa with the carpus much shorter than the propodus, and the propodus densely setose on the posterior margin. Tasmanosa also has a longer and more weakly tapering gnathopod 1 coxa than Cedrosella Barnard & Karaman, 1987 , in addition to having more finely serrate setal-teeth.