Lysianella moonamoona, 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 : 14-15

Lysianella moonamoona sp. nov.

( Figs 9–11 )

Types. Holotype, immature (?) male, 3.2 mm, AM P.68976, off mouth of Moona Moona Creek , Jervis Bay, New South Wales, Australia (35°2.9’S 150°41.0'E), 4 m, macroalga Ecklonia sp. holdfast, hand collected on scuba, September 1981, coll. P.B. Berents.

Type locality. Off mouth of Moona Moona Creek, Jervis Bay, New South Wales, Australia; 4 m depth.

Etymology. Named for Moona Moona Creek, the type locality; used as a noun in apposition.

Description. Based on holotype, (?) male, 3.2 mm. Head lateral cephalic lobe narrowly rounded; eyes oval. Antenna 1 accessory flagellum not forming operculum, 4-articulate; primary flagellum with weak 1-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; article 4 slightly swollen; flagellum short, calceoli absent. Labrum, epistome and upper lip separate; epistome less produced than upper lip, straight; upper lip produced, apically subacute. Mandible molar with reduced column and reduced triturating surface; palp attached slightly distally, article 3 without A3-setae. 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 1 short apical robust seta; palp article 4 well-developed.

Pereonites 1–7 dorsally smooth. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular, with straight anterior margin; basis without setae along anterior margin; ischium short; carpus short, subequal in length to propodus, without posterior lobe; propodus small, margins subparallel, sparsely setose along posterior margin, palm transverse to slightly acute, entire, straight. Gnathopod 2 minutely chelate; propodus palm slightly obtuse. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 basis about as long as 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 rounded. Urosomite 1 with slight notch. Uropod 2 inner ramus with weak constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 long, without plumose setae on rami. Telson entire , as long as wide, apically convex without dorsal robust setae, with 2 apical robust setae on each lobe.

Sexually dimorphic characters. Not known.

Remarks. We have tentatively placed this species in the genus Lysianella . The antenna 2 peduncle article 4 is not as enlarged as in other species of the genus. The description is based on a small, probably immature, specimen. We consider that this character has not yet fully developed in the material at hand.

Depth range. 4 m.

Distribution. Australia. Recorded only from Jervis Bay, New South Wales.

Figures

FIGURE 9. Lysianella moonamoona sp. nov., habitus, holotype, male, 3.2 mm, AM P.68976, from off mouth of Moona Moona Creek, Jervis Bay, New South Wales, Australia.

FIGURE 10. Lysianella moonamoona sp. nov., holotype, male, 3.2 mm, AM P.68976, from off mouth of Moona Moona Creek, Jervis Bay, New South Wales, Australia. Scale: 0.1 mm.

FIGURE 11. Lysianella moonamoona sp. nov., holotype, male, 3.2 mm, AM P.68976, from off mouth of Moona Moona Creek, Jervis Bay, New South Wales, Australia. Scale: 0.1 mm.