Tasmanosa toogooloo, 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 : 48

Tasmanosa toogooloo sp. nov.

( Figs 35–37 )

Types. Holotype female, 5.0 mm, AM P.70550, east of Long Reef Point , New South Wales, Australia (33°46'S 151°43'E), 176 m, dredge, 5 December 1977, FRV Kapala stn K77-23-01 . Paratypes: 1 male, 4.2 mm, AM P.70551; 1 female, 5.2 mm, AM P.70552; 2 specimens, 3.0– 4.8 mm, AM P.70553, same collection details as holotype; 1 specimen, 5.0 mm AM P.71607, east of Long Reef , New South Wales, Australia (33°43’S 151°46’E to 33°44’S 151°46’E), 174 m, epibenthic sled, 20 December 1985, J.K. Lowry & R.T. Springthorpe, FRV Kapala stn K 85-21-08 .

Additional material examined. 1 male, AM P.70554, north-east of Wollongong , New South Wales, Australia (34°20’S 151°18’E), 161 m, dredge, 13 December 1978, FRV Kapala stn K78-27-11 .

Type Locality. East of Long Reef Point , New South Wales, Australia (33°46'S 151°43'E), 176 m depth .

Etymology. Named for the schooner Toogooloo, foundered in 1901 off the central coast of New South Wales; used as a noun in apposition.

Description. Based on holotype female, 5.0 mm, AM P.70550. Head lateral cephalic lobe subtriangular, apically subacute. Antenna 1 accessory flagellum not forming operculum; primary flagellum with strong 2-field callynophore, robust setae absent from 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; 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 2 long slender apical robust setae.

Pereonites 1–7 dorsally smooth. Gnathopod 1 s ubchelate; coxa large, about as long as coxa 2, slightly tapering distally; basis moderately setose along anterior margin; ischium short; carpus short to compressed, shorter than propodus, without posterior lobe; propodus densely setose along posterior margin, palm transverse, straight, rugose. Gnathopod 2 propodus palm slightly obtuse. Pereopod 5 coxa equilobate; basis longer than broad, not posteroproximally excavate, posterior margin weakly serrate. Pereopod 7 basis posterodistally produced less than halfway along merus.

Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner narrowly rounded. Urosomite 1 with deep notch and subtriangular, subacute boss. 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 2 dorsal robust setae and 1 apical robust seta on each lobe.

Sexually dimorphic characters. Based on paratype, male, 4.2 mm, AM P.70551. Antenna 1 and 2 calceoli present, small.

Remarks. The gnathopod 1 of Tasmanosa toogooloo sp. nov. is quite different from that of its congener T. tasman sp. nov. The carpus is much shorter in T. toogooloo and it lacks the distinctly striated palm of T. tasman . Additionally, T. toogooloo has a propodus that is densely setose along both the anterior and posterior margins, as opposed to T. tasman , in which just the posterior margin of the propodus is setose. The pereopod 5 coxa is equilobate (producing an anterior lobe in T. tasman ), and urosomite 1 has a distinct subacute boss (dorsally straight and obliquely truncated apically in T. tasman ).

Depth range. 161–176 m.

Distribution. Australia. New South Wales.

Figures

FIGURE 35. Tasmanosa toogooloo sp. nov., holotype, female, 5.0 mm, AM P.70550, from east of Long Reef Point, New South Wales, Australia. Scale: 0.1 mm.

FIGURE 36. Tasmanosa toogooloo sp. nov., holotype, female, 5.0 mm, AM P.70550; paratype, male, 4.2 mm, AM P.70551, from east of Long Reef Point, New South Wales, Australia. Scale: MD, MX1, 0.05 mm, remainder, 0.1 mm.

FIGURE 37. Tasmanosa toogooloo sp. nov., holotype, female, 5.0 mm, AM P.70550; paratype, male, 4.2 mm, AM P.70551, from east of Long Reef Point, New South Wales, Australia. Scale: 0.1 mm.