Euonyx urania, Lowry & Kilgallen, 2014

Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), Zootaxa 3867 (1), pp. 1-92 : 22-25

Euonyx urania sp. nov.

( Figs 10–12 )

Types. Holotype, female, 19.0 mm, AM P.68881, east of Broken Bay , New South Wales, Australia (33°35.0’S 152°05.0’E to 37°37.0’S 152°05.0’E), 1144 m, dredge 10 December 1980, FRV Kapala [K80-20-10].

Type locality. East of Broken Bay, New South Wales, Australia (33°35.0’S 152°05.0’E to 37°37.0’S 152°05.0’E), 1144 m depth.

Etymology. Named for the sailing vessel Urania lost off the central New South Wales coast in December 1876; used as a noun in apposition.

Description. Based on holotype, female, 19.0 mm. Head, lateral cephalic lobe subtriangular, apically acute and slightly upturned; eyes apparently absent. Antenna 1 peduncular article 1 with well-developed anterodistally rounded lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore, 6-articulate, terminal article not offset; primary flagellum with strong 2-field callynophore; robust setae present on proximal articles; calceoli absent. Antenna 2 peduncle articles 3 to 5 not enlarged, brush setae absent; flagellum long; calceoli absent. Labrum, epistome and upper lip separate; epistome less produced than upper lip, slightly concave; upper lip produced, downward-pointing and acute apically. Mandible incisor small, left and right slightly asymmetrical; molar absent; palp attached about midway, article 2 with central bulge. Maxilla 1 outer plate setal-tooth 7 present, not cuspidate; palp distal margin with apical robust setae. Maxilla 2 inner plate significantly shorter than outer plate. Maxilliped outer plate apical robust setae absent (with 3 subapical robust setae along inner margin).

Gnathopod 1 chelate; coxa vestigial, significantly shorter than coxa 2, subquadrate; basis sparsely setose along anterior margin; ischium very long (length 4 × to 6 × breadth); carpus very long (length more than 4 × breadth), longer than propodus, without posterior lobe; propodus margins subparallel, palm obtuse, entire, straight; dactylus simple. Gnathopod 2 propodus palm slightly acute. Pereopod 4 coxa with a well-developed posteroventral lobe.

Pereopod 5 coxa without distinct lateral ridge; basis broader than long, posterior margin weakly or not 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 forming, weak spine. Urosomite 1 not projecting over urosomite 2, with a weakly produced, broadly truncated boss. Uropod 2 inner ramus without constriction. Peduncle without dorsolateral flange; outer ramus article 2 short, without plumose setae on rami. Telson deeply cleft .

Sexually dimorphic characters. Unknown.

Depth range. 1144 m.

Remarks. See remarks under E. chelatus .

Distribution. Australia. New South Wales.

Figures

FIGURE 10. Euonyx urania sp. nov., holotype, female, 19.0 mm, AM P.68881, from east of Broken Bay, New South Wales, Australia.

FIGURE 11. Euonyx urania sp. nov., holotype, female, 19.0 mm, AM P.68881, from east of Broken Bay, New South Wales, Australia. Scale bars: 0.2 mm.

FIGURE 12. Euonyx urania sp. nov., holotype, female, 19.0 mm, AM P.68881, from east of Broken Bay, New South Wales, Australia. Scale bars: 0.2 mm.