Photosella miersi ( Stebbing, 1888 )

Lowry, J. K. & Stoddart, H. E., 2011, The tryphosine genera Photosella gen. nov. and Tryphosella Bonnier, 1893 (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae) in Australian waters 2956, Zootaxa 2956 (1), pp. 1-76 : 7-9

Photosella miersi ( Stebbing, 1888)

( Figs 2–4 )

Hippomedon miersi Stebbing, 1888: 631 , pl. 10.

Anonyx Miersii. — Della Valle, 1893: 813.

Tmetonyx miersi . ― Stebbing, 1906: 74 (key), 75. — Sheard, 1937: 19. —J.L. Barnard, 1958: 100. —J.L. Barnard, 1962: 29, 30 (key). — Thurston & Allen, 1969: 369.

Tryphosella miersi . — Barnard & Karaman, 1991: 537.

Galathella miersi . — Lowry & Stoddart, 2003: 280.

Type locality. East of Moncoeur Island , Bass Strait, Australia, 39°10'30''S 146°37'00''E, 69.5 m depth .

Material examined. New South Wales: 43 specimens, AM P.58468, north-east of Coffs Harbour , 30°14'38"S 153°27'41"E, 100 m, baited trap, 12–13 August 1993, P.B. Berents, R. T . Springthorpe & W. Vader, MV Cheryl Lee , stn NSW-884 ; 3 specimens, AM P.52619, north-east of Coffs Harbour , 30°15'45"S 153°21'59"E, 100 m, baited trap, 12–13 August 1993, P.B. Berents, R. T . Springthorpe & W. Vader, MV Cheryl Lee , stn NSW-886 ; 11 specimens, AM P.52651, same data, stn NSW-887 ; 17 specimens, AM P.55969, north-east of Coffs Harbour , 30°15'56"S 153°21'54"E, 100 m, baited trap, 11–12 August 1993, P.B. Berents, R. T . Springthorpe & W. Vader, MV Cheryl Lee , stn NSW-870 ; 1 specimen, AM P.57620 and 14 specimens, AM P.57621, same data, stn NSW-872 ; 6 specimens, AM P.48195, north-east of Coffs Harbour , 30°15'56"S 153°21'54"E, 100 m, baited trap, 8–9 September 1994, J.K. Lowry & K. Dempsey, MV Carrie Anne , stn NSW-984 ; 20 specimens, AM P.48184, same data, stn NSW-985 ; 3 specimens, AM P.48428, same data, 9–10 September 1994, stn NSW-1006 ; 1 female, AM P.70483, south-east of Port Stephens , 32°52’S 152°32’E, 145 m, dredge, 6 December 1978, FRV Kapala , stn K78-26-07 ; 1 male, 13.2 mm, AM P.70484, east of Long Reef Point , 33°43’S 151°46’E to 33°44’S 151°46’E, 174 m, epibenthic sled, 19 December 1985, 2230–2300 hrs, J.K. Lowry & R. T . Springthorpe , FRV Kapala , stn K85-21-08 ; 1 male, AM P. 1825123 km east of Cape Banks , 33°58'24"S 151°29'E, 150 m, orange-peel grab, 18 June 1962, CSIRO Fisheries, HMAS Gascoyne , stn G2/62/56 . Victoria: 1 specimen, MV J62295 , 31 km south-south-west of Cape Otway, western Bass Strait , 39°08'S 143°24'E, 77 m, medium sand, Smith-McIntyre grab, 8 October 1980, G.C.B. Poore, HMAS Kimbla , stn BSS-56G ; 1 specimen, MV J62294 , 32 km south-south-west of Cape Otway, western Bass Strait , 39°09'S 143°26'E, 85 m, coarse carbonate sand, dredge, 8 October 1980, G.C.B. Poore, HMAS Kimbla , stn BSS-55D ; 1 specimen, MV J62299 , 51 km south-south-west of Cape Otway, western Bass Strait , 39°18'S 143°03'E, 113 m, coarse carbonate sand, Smith-McIntyre grab, 10 October 1980, G.C.B. Poore, HMAS Kimbla , stn BSS-69G ; 1 specimen, MV J62296 , 26 km south-west of Cape Otway, western Bass Strait , 39°01.0'S 143°22.1'E, 84 m, medium sand, dredge, 31 January 1981, M. Gomon et al., FRV Hai Kung, stn BSS-120D ; 3 specimens, MV J62297 , 38 km south-west of Cape Paterson, central Bass Strait , 38°56.4'S 14516.6'E, 70 m, fine sand, epibenthic sled, 12 November 1981, R . Wilson , RV Tangaroa , stn BSS-155S; 1 specimen, MV J62298 , 44 km north-north-east of Cape Wickham, King Island, central Bass Strait , 39°16.0'S 144°05.4'E, 82 m, sandy shell, rock dredge, 23 November 1981, R . Wilson , RV Tangaroa , stn BSS-204RD. Tasmania: 1 male, AM P.70485, 1 female, AM P.70486 and 4 specimens, AM P.70487, about 80 m outside Hannants Bight, north side of Cape Sorell , 42°11.5'S 145°11'E, 18 m, baited trap on sand and detritus, 26–27 April 1991, J.K. Lowry & S.J. Keable, stn TAS-277 ; 1 specimen, AM P.70488, about 400 m outside Hannants Bight on a line toward large bluff of Ocean Beach, north side of Cape Sorell , 42°11.4'S 145°11.1'E, 30 m, baited trap on sand, 26–27 April 1991, J.K. Lowry & S.J. Keable, stn TAS-279 ; 5 specimens, AM P.70489, about 50 m offshore and just east of Hannants Bight on a line toward large bluff of Ocean Beach, north side of Cape Sorell , 42°11.5'S 145°11.4'E, 18 m, baited trap on sand, 26–27 April 1991, J.K. Lowry & S.J. Keable, stn TAS-281 ; 6 specimens, AM P.45776, east of Fortescue Bay, north of Hippolyte Rocks , 43°06'42"S 148°03'27"E, 100 m, baited trap, 16–17 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise , stn TAS-353 ; 68 specimens, AM P.51085, same data, stn TAS-354 ; 6 specimens, AM P.58244 and 1 specimen, AM P.70490, same data, 8–9 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan , stn TAS-389 ; 38 specimens, AM P.51090, same data, stn TAS-390 ; 40 specimens, AM P.51191, same data, stn TAS-391 ; 38 specimens, AM P.51332, same data, 9–10 April 1994, stn TAS-408 ; 20 specimens, AM P.51318, same data, stn TAS- 409 ; 1 specimen, AM P.45747, mouth of Fortescue Bay , 43°07'46"S 145°59'28"E, 100 m, baited trap, 16–17 April 1993, J.K. Lowry & P. Freewater, MV Tasmanian Enterprise , stn TAS-350 ; 2 specimens, AM P.51314, same data, 9–10 April 1994, J.K. Lowry & K. Dempsey, MV Martrudan , stn TAS-406 . South Australia: 1 female, AM P.70491, Marino, Gulf St Vincent , approx. 35°03'S 138°31'E, 1910, W.H. Baker . Western Australia: 1 specimen, P.18195, east of Albany , 34°32'S 121°31'E, orange-peel grab, 9 July 1962, CSIRO Fisheries, HMAS Gascoyne , stn G2/62/109 ; 1 specimen, AM P.70492, north-west of Port Hedland, North West Shelf , 19°05.3'S 118°54.0'E to 19°05.1'S 118°54.2'E, 82–83 m, epibenthic sled, 15 February 1983, FRV Soela, CSIRO stn NWS 01.B4.S; 1 female, AM P.70493, north-west of Port Hedland, North West Shelf , 19°05.4'S 118°53.9'E to 19°05.3'S 118°54.0'E, 80 m, beam trawl, 30 October 1983, FRV Soela, CSIRO stn NWS 05.B4.BT; 3 specimens, AM P.70494, north-west of Port Hedland, North West Shelf , 19°04.8'S 118°50.7'E to 19°05.2'S 118°50.4'E, 81 m, epibenthic sled, 30 October 1983, FRV Soela, CSIRO stn NWS 05.B5.S; 4 specimens, AM P.70495, north-west of Port Hedland, North West Shelf , 19°04.1'S 118°47.8'E to 19°04.7'S 118°47.2'E, 82 m, epibenthic sled, 30 October 1983, FRV Soela, CSIRO stn NWS 05.B6.S; 2 specimens, AM P.70496, north-west of Port Hedland, North West Shelf , 19°02.0'S 118°47.2'E to 19°01.7'S 118°47.1'E, 82 m, epibenthic sled, 7 December 1982, FRV Soela, CSIRO stn NWS 06.B6.S

Diagnostic description. Head lateral cephalic lobe subtriangular, apically subacute; eyes (fading in alcohol), large, subtriangular with ventral concave lens. Antenna 1 flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular articles 4 and 5 not enlarged; flagellum short, calceoli absent. Epistome/Upper lip epistome less produced than upper lip, straight. Mandible molar with asymmetrically reduced column, proximally setose, distally triturating. Maxilla 1 setal-tooth 7, left and right symmetrical, cuspidate along most of straight inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 2 short apical robust setae.

Gnathopod 1 subchelate; coxa large (length 1.8 x breadth), subrectangular, distally subovate; basis moderately setose along anterior margin; ischium short (length 1.4 x breadth); carpus long (length 2 x breadth), shorter than propodus, without posterior lobe; propodus margins subparallel, palm moderately acute. Gnathopod 2 propodus palm moderately obtuse. Pereopod 4 coxa without distinct lateral ridge. Pereopod 5 coxa without distinct lateral ridge; basis about as long as broad, with photophore.

Epimeron 3 posterior margin smooth, posteroventral corner broadly rounded. Urosomite 1 with anterodorsal notch and slightly rounded boss. Uropod 3 outer ramus article 2 short, with plumose setae on both rami. Telson deeply cleft, with dorsal robust setae, with 1 or 2 apical robust setae on each lobe.

Male (sexually dimorphic characters). Antennae 1 and 2 calceoli present. Antenna 2 peduncular article 4 enlarged.

Remarks. Although Stebbing (1888) did not record or illustrate a photophore on the basis of pereopod 5 of his specimen we feel sure the present material is the same species. It is possible that Stebbing overlooked the structure, as it can be very difficult to discern in material that is de-calcified by preservatives. Photosella miersi is the only species in the genus without ridging on the coxa of pereopods 4 or 5.

Distribution. South-eastern and southern Australia to Port Hedland in north-western Australia; 18–174 m depth.

Figures

FIGURE 2. Photosella miersi (Stebbing, 1888). Hannants Bight, north side of Cape Sorell, Tasmania.

FIGURE 3. Photosella miersi (Stebbing, 1888). Female, 13.0 mm, AM P.70483; male, 13.2 mm, AM P.71834; New South Wales. Scales for A1, A2 represent 0.5 mm; remainder represent 0.2 mm.

FIGURE 4. Photosella miersi (Stebbing, 1888). Female, 13.0 mm, AM P. 70483, New South Wales. Scales represent 0.5 mm.