Patonga nona, 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 : 41-44

Patonga nona sp. nov.

( Figs 29–31 )

Types. Holotype female, 3.3 mm, AM P.69443, 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 female, 3.2 mm, AM P.69444, same collection data as holotype ; 1 female, 3.4 mm, AM P.69445, Cape Banks , New South Wales, Australia (34°00’S 151°16’E) 65–70 m, Smith-McIntyre Grab, 29 October 1990 – 14 November 1990, The Ecology Lab for RMI/Pioneer Project stn 3-185 .

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

Etymology. Named for the sailing vessel Nona, wrecked in 1857 in Broken Bay during a gale; used as a noun in apposition.

Description. Based on holotype female, 3.3 mm, AM P.69443. Head lateral cephalic lobe margins straight dorsally, ventrally sinusoidal, apically acute. Antenna 1 accessory flagellum not forming operculum, terminal article not offset; 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/upper lip separate; epistome produced equally with upper lip, slightly concave; upper lip not produced. Mandible molar with reduced column and reduced triturating surface; palp attached midway. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally along inner margin; palp distal margin with apical robust setae. Maxilliped basis without recurved hook.

Pereonites 1–7 dorsally smooth. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis moderately setose along anterior margin; ischium short; carpus long, longer than propodus, without posterior lobe; propodus small, margins subparallel, sparsely setose along posterior margin, palm moderately acute, entire, straight. Gnathopod 2 propodus palm transverse. Pereopod 5 basis longer than broad, not posteroproximally excavate, posterior margin not serrate. Pereopod 7 basis posterodistally produced, not reaching merus; not posterodistally excavate.

Pleonites 1–3 without mid-dorsal carina, not produced dorsodistally. Epimeron 3 posterior margin smooth, posteroventral corner subquadrate. Urosomite 1 with slight notch. Uropod 3 peduncle without dorsolateral flange; inner and outer rami well developed, outer ramus article 2 short, with plumose setae on both rami. Telson deeply cleft, longer than wide, with 2 dorsal robust setae per lobe and 1 apical robust seta on each lobe.

Sexually dimorphic characters. Unknown.

Depth range. 65–176 m.

Distribution. Australia. Coast of New South Wales.

Figures

FIGURE 29. Patonga nona sp. nov., habitus, holotype, female, 3.3 mm, AM P.69443, east of Long Reef Point, New South Wales, Australia.

FIGURE 30. Patonga nona sp. nov., holotype, female, 3.3 mm, AM P.69443, east of Long Reef Point, New South Wales, Australia. Scale: 0.1 mm.

FIGURE 31. Patonga nona sp. nov., holotype, female, 3.3 mm, AM P.69443, east of Long Reef Point, New South Wales, Australia. Scale: gnathopods, pereopods, 0.2 mm; uropods, telson, 0.1 mm.