Tasmanosa tasman sp. nov.

(Figs 32–34)

Types. Holotype, ovigerous female, 10.2 mm, AM P.71642, east of Fortescue Bay, Tasmania, Australia (43°8.96’S 148º15.36’E), 1000 m, baited trap, 8 April 1994 – 09 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan stn TAS-423 . Paratypes: 5 specimens, 7.5–8.0 mm, AM P.51093, and 2 specimens, 4.8–8.5 mm, AM P.52149, both with same collection details as holotype; 1 male, 10.0 mm, AM P.71643, and 40 specimens, 7.0– 15.5 mm, AM P.71644, 76.8 km south-southeast of South East Cape, Main Pedra Hill, Tasmania, Australia (44º15.6’S 147º07.8’E), 1312 m, baited trap, 21 January 1997 – 24 January 1997, CSIRO party, FRV Southern Surveyor stn SS01/97/08 .

Additional material examined. 1 specimen, AM P.73699, Tasman Sea, south-southeast of South East Cape, Tasmania, Australia (44º23.4’S 147º16.2’E), 1942 m, baited trap, 31 January 1997 – 31 January 1997, CSIRO party, FRV Southern Surveyor stn SS01/97/65 ; 307 specimens, AM P.78689, Tasman Sea, 76.8 km south-south-east of South East Cape, Main Pedra Hill, Tasmania, Australia (44º15.6’S 147º07.8’E), 1312 m, baited trap, 21 January 1997 – 24 January 1997, CSIRO party, FRV Southern Surveyor stn SS01/97/08; many specimens, AM P.73700, Tasman Sea, 76.8 km south-southeast of South East Cape, Main Pedra Hill, Tasmania, Australia (44º15.6’S 147º07.8’E), 1312 m, baited trap, 21 January 1997 – 24 January 1997, CSIRO party, FRV Southern Surveyor stn SS01/97/08 .

Type Locality. East of Fortescue Bay, Tasmania, Australia (43°8.96’S 148º15.36’E), 1000 m depth .

Etymology. Named for the steamship Tasman lost near Hippolyte Rocks, Tasmania in November 1883; used as a noun in apposition.

Description. Based on holotype, female, 10.2 mm AM P.71642. Head lateral cephalic lobe subtriangular, apically acute. Antenna 1 accessory flagellum not forming operculum; primary flagellum with strong 2-field callynophore, robust setae present on proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged; flagellum short, calceoli absent. Labrum, epistome and upper lip separate; epistome produced equally with upper lip, broadly rounded; upper lip not produced. Mandible molar with asymmetrically reduced column, proximally setose, distally triturating. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped outer plate with 4 long, slender apical robust setae.

Pereonites 1–7 dorsally smooth. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, slightly tapering distally; basis densely setose along anterior margin; ischium short; carpus short, shorter than propodus, without posterior lobe; propodus densely setose along posterior margin, palm transverse, straight, striated. Gnathopod 2 minutely subchelate; propodus palm transverse to slightly obtuse. Pereopod 5 coxa producing anterior lobe; basis longer than broad, not posteroproximally excavate, posterior margin weakly serrate. Pereopod 7 basis posterodistally produced, reaching merus.

Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, rounded, posteroventral corner narrowly rounded. Urosomite 1 dorsally straight, obliquely truncated apically . Uropod 2 inner ramus without constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 short, without plumose setae on rami. Telson deeply cleft, longer than wide, with 1 dorsal robust seta and 1 apical robust setae on each lobe.

Sexually dimorphic characters. Based on paratype, male, 10.0 mm, AM P.71643. Antenna 1 and 2 with calceoli.

Remarks. See remarks under Tasmanosa toogooloo sp. nov.

Depth range. 1000–1942 m.

Distribution. Australia. Tasmania.