Paralysianopsis pomona, 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 : 33-37

Paralysianopsis pomona sp. nov.

( Figs 24–26 )

Types. Holotype, female, 5.2mm, NMV J67540 , South of Point Hicks , Victoria, Australia (38°17.70'S 149°11.30'E), 400 m, coarse sand, gravel, mud, many sponges, WHOI epibenthic sled, 24 July 1986, M.F. Gomon et al., RV Franklin SLOPE stn 40 . Paratypes: 1 female 5.1 mm, NMV J67543 ; 1 male, 3.1 mm, NMV J67541 ; 12 specimens, 1.6–5.6 mm, NMV J67542 , all with same collection details as holotype.

Additional material examined. New South Wales. 3 specimens, NMV J14770 , Off Eden (37°0.60'S 150°20.70'E), 363 m, coarse shell, WHOI epibenthic sled, 21 July 1986, G.C.B. Poore et al., RV Franklin, SLOPE stn 22 ; 2 specimens, NMV J67544 , 44 km east of Nowra (34°55.79'S 151°08.06'E), 429 m, muddy coarse shell, WHOI epibenthic sled, 22 October 1988, G.C.B. Poore et al., RV Franklin, SLOPE stn 56 ; 1 male, AM P.50753, north-east of Coffs Harbour (30°14.83’S 153°27.56’E), 200 m, baited trap, 8 September 1994 – 09 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Ann stn NSW-987 ; 775 specimens, AM P.44281, east of Wollongong (34°28’S 151°02’E), 100 m, baited trap, 28 March 1994 – 29 March 1994, J.K. Lowry & K. Dempsey, MV Robin E stn NSW-961 ; 4 specimens, AM P.47028, off Wollongong (34°32.08’S 151°12.56’E), 200 m, baited trap, 7 May 1993 – 08 May 1993, P. Freewater & party, MV Robin E stn NSW-797 ; 1 specimen, AM P.50739, off Wollongong (34°32.02’S 151°13.0’E), 200 m, baited trap, 06 May 1993 – 07 May 1993, P. Freewater & party, MV Robin E stn NSW-781 ; 2 specimens, AM P.50738, off Wollongong (34°32.02’S 151°13.0’E), 200 m, baited trap, 06 May 1993 – 07 May 1993, P. Freewater & party, MV Robin E stn NSW-780 ; 1 specimen, AM P.43494, off Wollongong (34°31.48’S 151°13.22’E), 200 m, baited trap, 27 March 1994 – 28 March 1994, J.K. Lowry & K. Dempsey, MV Robin E stn NSW-945 ; 3 specimens, AM P.51127, due east of Coffs Harbour (30°17.48’S 153°13.9’E), 45.4 m, baited trap, 11 August 1993 – 12 August 1993, P.B. Berents, R. T. Springthorpe & W. Vader, MV Cheryl Lee stn NSW-875 ; 3 specimens, AM P.44301, off Wollongong (34°26.53’S 150°57.98’E), 50 m, baited trap, 27 March 1994 – 28 March 1994, J.K. Lowry & K. Dempsey, MV Robin E stn NSW-939; 1003 specimens, AM P.50740, off Wollongong (34°28.22’S 151°02.28’E), 100 m, baited trap, 7 May 1993 – 08 May 1993, P. Freewater & party, MV Robin E stn NSW-795 ; 318 specimens, AM P.50736, off Wollongong (34°28.15’S 151°02.37’E), 100 m, baited trap, 06 May 1993 – 07 May 1993, P. Freewater & party, MV Robin E stn NSW-778 ; 94 specimens, AM P.50735, off Wollongong (34°28.15’S 151°02.37’E), 100 m, baited trap, 06 May 1993 – 07 May 1993, P. Freewater & party, MV Robin E stn NSW-776 ; 816 specimens, AM P.50741, off Wollongong (34°28.22’S 151°02.28’E), 100 m, baited trap, 7 May 1993 – 08 May 1993, P. Freewater & party, MV Robin E stn NSW-796 .

Queensland. 1 specimen, AM P.47912, due east of Mooloolaba (26º39.12’S 153º18.87’E), 50 m, baited trap, 3 April 1994 – 4 April 1994, J.K. Lowry & K. Dempsey, MV Capricorn I, SEAS stn QLD-1142 .

Tasmania. 4 specimens, NMV J67545 , off Freycinet Peninsula (42°2.20'S 148°38.70'E), 800 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al., RV Franklin, SLOPE stn 45 ; 13 specimens, NMV J67546 , off Freycinet Peninsula (42°0.20'S 148°37.70'E), 720 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al., RV Franklin, SLOPE stn 46 ; 1 specimen, NMV J67547 , off Freycinet Peninsula (41°57.50'S 148°37.90'E), 400 m, coarse shell, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al., RV Franklin SLOPE stn 48; 1? female, AM P.69634, mouth of Fortescue Bay (43°07.77’S 147°59.47’E), 50 m, baited trap, 8–9 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan stn TAS-386 ; 15 specimens, AM P.51106, mouth of Fortescue Bay (43°07.77’S 147°59.47’E), 50 m, baited trap, 8–9 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan stn TAS-386 ; 16 specimens, AM P.51089, mouth of Fortescue Bay (43°07.77’S 147°59.47’E), 50 m, baited trap, 8–9 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan stn TAS-387 ; 25 specimens, AM P.58332, mouth of Fortescue Bay (43°07.77’S 147°59.47’E), 50 m, baited trap, 9 April 1994 – 10 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan stn TAS-406 .

Victoria. Many specimens, NMV J67548 , south of Point Hicks (38°21.90'S 149°20.00'E), 1000 m, WHOI epibenthic sled, 23 July 1986, G.C.B. Poore et al., RV Franklin SLOPE stn 32 ; 2 specimens, NMV J67549 , south of Point Hicks (38°14.80'S 149°9.30'E), 200 m, coarse sand, gravel, WHOI epibenthic sled, 24 July 1986, M.F. Gomon et al., RV Franklin, SLOPE stn 41 .

Bass Strait. 7 specimens, NMV J67550 , eastern Bass Strait , 63 km east of North Point , Flinders Island (39º44.8’S 148º40.6’E), 124 m, muddy sand, WHOI epibenthic sled, 14 November 1981, R. Wilson, RV Tangaroa stn BSS-167S ; 1 specimen, NMV J67551 , eastern Bass Strait , 85 km north-east of North Point , Flinders Island (39º02.4’S 148º30.6’E), 120 m, muddy sand, 15 November 1981, R. Wilson, RV Tangaroa stn BSS-169 ; 2 specimens, NMV J67552 , eastern Bass Strait , 100 km north-east of North Point , Flinders Island (38º51.8’S 148º26.5’E), 130 m, fine sand, WHOI epibenthic sled, 15 November 1981, R. Wilson, RV Tangaroa stn BSS-170S ; 1 specimen, NMV J67554 , western Bass Strait , 54 km west of Stokes Point , King Island (40º06.0’S 143º17.0’E), 158 m, medium sand, Smith-McIntyre Grab, 11 October 1980, G.C.B. Poore, HMAS Kimbla stn BSS-100G ; 10 specimens, NMV J67553 , Western Bass Strait , 36 km SSW of Stokes Point, King Island (40º26.7’S 143º41.4’E), 85 m, medium sand, 22 November 1981, R. Wilson, RV Tangaroa stn BSS-198 ;

Type locality. South of Point Hicks , Victoria, Australia (38°17.70'S 149°11.30'E), 400 m depth .

Etymology. Named for the sailing vessel Pomona, blown ashore between Lake Tyers and the mouth of the Snowy River in 1866; used as a noun in apposition.

Description. Based on holotype, female, 5.2 mm, NMV J67540 . Head lateral cephalic lobe apically rounded; eyes oval. Antenna 1 accessory flagellum not forming operculum; primary flagellum with weak 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged, brush setae absent; flagellum short, calceoli absent. Labrum, epistome and upper lip separate; epistome not produced, concave; upper lip not produced. Mandible molar setose with a vestigial triturating surface. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally; palp with robust setae along half of the distal margin, serrate along other half. Maxilliped outer plate apical robust setae absent.

Pereonites 1–7 dorsally smooth. Gnathopod 1 weakly subchelate, appearing simple; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis sparsely setose along anterior margin; ischium short; carpus short, subequal in length to propodus, without posterior lobe; propodus small, sparsely setose along posterior margin, palm extremely acute, entire, straight. Gnathopod 2 propodus palm transverse, with minutely serrate pad on posterior corner. Pereopod 5 basis about as long as broad, not posteroproximally excavate, posterior margin not serrate. Pereopod 7 basis posterodistally produced, not reaching merus.

Pleonite 3 without mid-dorsal carina, not produced dorsodistally, posterodorsal margin not produced. Epimeron 3 posterior margin smooth, posteroventral corner produced, narrowly rounded. Urosomite 1 with slight notch dorsally. Uropod 2 inner ramus with moderate constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 long, without plumose setae on rami. Telson entire , slightly longer than wide, truncated with 2 subapical robust setae.

Sexually dimorphic characters. Based on paratype, male, 3.1 mm, NMV J67541 . Head lateral cephalic lobe subacute, slightly downward-pointing. Upper lip produced slightly in front of epistome. Antenna 1 primary flagellum with strong 2-field callynophore.

Remarks. Paralysianopsis pomona sp. nov. is most similar to P. cf. jebbi . However, the upper lip of P. cf. jebbi is more produced and rounded than that of P. pomona ; the maxilla 1 palp of P. cf. jebbi lacks any robust setae (robust setae are present in P. pomona ); and the pereopod 5 basis is longer than broad in P. cf. jebbi compared with P. pomona where it is as long as broad.

Depth range. 50– 800 m.

Distribution. Australia. Eastern coasts from Mooloolaba, Queensland, to the Freycinet Peninsula, Tasmania, and the Bass Strait.

Figures

FIGURE 24. Paralysianopsis pomona sp. nov., habitus, paratype female, 5.1 mm, NMV J67543, from south of Point Hicks, Victoria, Australia.

FIGURE 25. Paralysianopsis pomona sp. nov., holotype female, 5.2 mm, NMV J67540; paratype male, 3.1 mm, NMV J67541, from south of Point Hicks, Victoria, Australia. Scale: 0.1 mm.

FIGURE 26. Paralysianopsis pomona sp. nov., holotype female, 5.2 mm, NMV J67540, from south of Point Hicks, Victoria, Australia. Scale: gnathopods, pereopods, 0.2 mm; uropods, telson, 0.1 mm.