Paralysianopsis capricornia, 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 : 23-28

Paralysianopsis capricornia sp. nov.

( Figs 17–19 )

Types. Holotype, female, 3.6 mm, AM P.70543, east of Fitzroy Reef , Queensland, Australia (23°32.53’S 152°16.45’E), 105 m, baited trap, 16 June 1993 – 17 June 1993, J.K. Lowry, P. Freewater & R.T. Springthorpe, MV Reefknot stn QLD-954/SEAS . Paratypes: 1 male, 2.4 mm, AM P.71608; 6 specimens, 2.9–4.2 mm, AM P.49695; 1 specimen, AM P.57642, 2.4 mm, east of Fitzroy Reef , Queensland, Australia (23°32.53’S 152°16.45’E), 105 m, baited trap, 16 June 1993 – 17 June 1993, J.K. Lowry, P. Freewater & R . T . Springthorpe , MV Reefknot stn QLD-954/ SEAS ; 1 male, 3.6 mm, AM P.71609; 28 specimens, 2.4–3.6 mm, AM P.57643, east of Fitzroy Reef , Queensland, Australia (23°32.53’S 152°16.45’E), 105 m, baited trap, 16 June 1993 – 17 June 1993, J.K. Lowry, P. Freewater & R . T . Springthorpe , MV Reefknot stn QLD-955/ SEAS .

Additional material examined. Queensland. 1 specimen, AM P.57749, east of Flynn Reef (16° 41.32’S 146°18.27’E), 100 m, baited trap, 06 June 1993 – 07 June 1993, J.K. Lowry, P. Freewater, W. Vader, RV Sunbird stn QLD-919/ SEAS ; 3 specimens, AM P.51125, east of Fitzroy Reef (23° 34.82’S 152°11.77’E), 58 m, baited trap, 3 June 1994 – 4 June 1994, J.K. Lowry & K. Dempsey, MV Reefknot stn QLD-1091 ; 1 specimen, AM P.57748, east of Flynn Reef (16° 41.32’S 146°18.27’E), 100 m, baited trap, 6 June 1993 – 7 June 1993, J.K. Lowry, P. Freewater, W. Vader, RV Sunbird stn QLD-918/ SEAS ; 3 specimens, AM P.50756, east of Fitzroy Reef (23°32.47’S 152°16.45’E), 58 m, baited trap, 2 June 1994 – 3 June 1994, J.K. Lowry & K. Dempsey, MV Reefknot stn QLD-1073 ; 1 specimen, AM P.51118, east of Fitzroy Reef (23°34.92’S 152°11.77’E), 58 m, baited trap, 16 June 1993 – 17 June 1993, J.K. Lowry, P. Freewater, R. T. Springthorpe , MV Reefknot stn QLD-953/ SEAS ; 5 specimens, AM P.71610, east of Fitzroy Reef (23°32.47’S 152°16.45’E), 100 m, baited trap, 2 June 1994 – 3 June 1994, J.K. Lowry & K. Dempsey, MV Reefknot stn QLD-1076 ; 39 specimens, AM P.50764, east of Fitzroy Reef (23°32.47’S 152°16.45’E), 100 m, baited trap, 3 June 1994 – 4 June 1994, J.K. Lowry & K. Dempsey, MV Reefknot stn QLD-1096 ; 8 specimens, AM P.58238, east of Fitzroy Reef (23°32.47’S 152°16.45’E), 100 m, baited trap, 2 June 1994 – 3 June 1994, J.K. Lowry & K. Dempsey, MV Reefknot stn QLD-1078 ; 15 specimens, AM P.49629, east of Fitzroy Reef (23°32.47’S 152°16.45’E), 100 m, baited trap, 2 June 1994 – 3 June 1994, J.K. Lowry & K. Dempsey, MV Reefknot stn QLD-1078 .

Type locality. East of Fitzroy Reef , Queensland, Australia (23°32.53’S 152°16.45’E), 105 m.

Etymology. The specific epithet “ capricornia ” refers to Capricornia Cays National Park, which includes Fitzroy Reef, the type locality; used as a noun in apposition.

Description. Based on holotype, female, ~ 3.6 mm, AM P.70543. Head lateral cephalic lobe broadly rounded; eyes oval to irregular. Antenna 1 accessory flagellum not forming operculum; primary flagellum with weak 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncle weakly geniculate between articles 3–4; 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 slightly produced in front of epistome, rounded. Mandible molar weakly setose with a vestigial triturating surface. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally; palp distal margin serrate/rugose, without apical robust setae. Maxilliped outer plate apical robust setae absent.

Pereonites 1–7 dorsally smooth. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis not setose along anterior margin; ischium short; carpus compressed, shorter than propodus, without posterior lobe; propodus large, not setose along posterior margin, palm transverse to slightly acute, irregular, with disk-like process on posterodistal corner. Gnathopod 2 minutely chelate; propodus palm transverse, convex. Pereopod 5 basis about as long as broad, not posteroproximally excavate, posterior margin weakly serrate. Pereopod 7 basis posterodistally produced to 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 slight notch dorsally. Uropod 2 inner ramus with slight constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 long, without plumose setae on rami. Telson entire , longer than wide, apically truncate, without robust setae.

Sexually dimorphic characters. Antenna 1 with strong 2-field callynophore. Antenna 2 peduncle articles 4 and 5 elongate. Gnathopod 1 propodus longer than gnathopod 1 of female, palm with strong, posteromedial robust seta.

Remarks. Gnathopod 1 of P. capricornia differs from all other Paralysianopsis in having a carpus that is nearly compressed and a very broad, strongly subchelate propodus that bears an unusual disk-like process into which the tip of the dactylus appears to close. All other characters fit the diagnosis for Paralysianopsis .

Depth range. 58–105 m.

Distribution. Australia. Great Barrier Reef, Queensland.

Figures

FIGURE 17. Paralysianopsis capricornia sp. nov., paratype, male, 3.6 mm, AM P.71609, from east of Fitzroy Reef, Queensland, Australia.

FIGURE 18. Paralysianopsis capricornia sp. nov., holotype, female, ~3.6 mm, AM P.70543, from east of Fitzroy Reef, Queensland, Australia. Scale: 0.1 mm.

FIGURE 19. Paralysianopsis capricornia sp. nov., holotype, female, ~3.6 mm, AM P.70543; paratype male, 3.6 mm, AM P.71609, from east of Fitzroy Reef, Queensland, Australia. Scale: 0.1 mm.