Tmetonyx mucronatus Pirlot, 1936: 275 Barnard, 1958: 100 Barnard, 1962: 30 Tryphosella mucronata Barnard & Karaman, 1991: 537 The tryphosine genera Photosella gen. nov. and Tryphosella Bonnier, 1893 (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae) in Australian waters 2956 Lowry, J. K. Stoddart, H. E. Zootaxa 2011 2011-07-08 2956 1 1 76 4GT9N (Pirlot, 1936) Pirlot 1936 [151,588,151,177] Malacostraca Tryphosidae Photosella Animalia Amphipoda 11 12 Arthropoda species mucronata  ( Figs 5, 6)      Tmetonyx mucronatus Pirlot, 1936: 275, fig. 108. —J.L.  Barnard, 1958: 100. —J.L.  Barnard, 1962: 30(key).    Tryphosella mucronata. —  Barnard & Karaman, 1991: 537.     Typelocality. North-west of Waigeo Island, West New Guinea, Indonesia, 0°3'8''N 130°24'E,  141 mdepth.  Material examined.All stations are north-west of Port Hedland, North West Shelf, Western Australiaand were collected by the CSIROon FRV Soela.  1 femaleand 1 male, AMP.71828, 19°56.8'S 117°53.4'Eto 19°56.4'S 117°53.7'E,  42 m, beam trawl,  22 April 1983, stn NWS 02.B2.BT;  6 specimens, AMP.71829, 19°56.9'S 117°53.7'Eto 19°56.4'S 117°53.8'E,  42–43 m, epibenthic sled,  22 April 1983, stn NWS 02.B2.S;  1 specimen, AMP.71830, 19°05.4'S 118°53.3'Eto 19°05.428.2'S 118°54.1'E,  82 m, epibenthic sled,  27 April 1983, stn NWS 02.B4.S; 1 ovigerous female, AMP.71831, 19°56.4'S 117°53.9'Eto 19°56.8'S 117°53.6'E,  44 m, epibenthic sled,  25 June 1983, stn NWS 03.B2.S;  3 specimens, AMP.71832, 19°56.8'S 117°53.5'Eto 19°56.4'S 117°53.9'E,  44 m, beam trawl,  25 June 1983, stn NWS 03.B2.BT;  1 male, AMP.71833, 19°56.6'S 117°54.1'Eto 19°56.3'S 117°53.9'E,  44 m, beam trawl,  26 August 1983, stn NWS 04.B2.BT;  1 male, AMP.71834, 19°56.7'S 117°53.6'Eto 19°56.4'S 117°54.0'E,  41 m, epibenthic sled,  26 October 1983, stn NWS 05.B2.S;  1 male, AMP.71835, 19°29.7'S 118°52.0'Eto 19°29.4'S 118°52.5'E,  39 m, epibenthic sled,  25 October 1983, stn NWS 05.D3.S;  1 female, AMP.71836, 19°29.6'S 118°51.7'Eto 19°29.9'S 118°51.0'E,  40–41 m, epibenthic sled,  25 October 1983, stn NWS 05.D7.S;  1 male, AMP.71837, 19°04.1'S 118°47.8'Eto 19°04.7'S 118°47.2'E,  82 m, beam trawl,  23 October 1983, stn NWS 05.B10.BT.  Diagnostic description. Headlateral cephalic lobe subtriangular, apically rounded; eyes (fading in alcohol), large, subtriangular with ventral concave lens. Antenna 1flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2peduncular articles 4 and 5 not enlarged; flagellum short, calceoli absent. Epistome/Upper lipepistome less produced than upper lip, straight. Mandiblemolar with asymmetrically reduced column, proximally setose, distally triturating. Maxilla 1setal-tooth 7, left and right symmetrical, cuspidate along most of straight inner margin; palp distal margin with apical robust setae. Maxillipedouter plate with 2 short apical robust setae.  Gnathopod 1subchelate; coxa large (length 1.9 x breadth), subrectangular, distally subovate; basis moderately setose along anterior margin; ischium short (length 1.6 x breadth); carpus long (length 2 x breadth), shorter than propodus, without posterior lobe; propodus margins subparallel, palm moderately acute. Gnathopod 2propodus palm moderately obtuse.  Pereopod 4coxa without distinct lateral ridge.  Pereopod 5coxa with distinct lateral ridge; basis about as long as broad, with photophore.  Epimeron 3posterior margin smooth, posteroventral corner broadly rounded. Uropod 3outer ramus article 2 short, with plumose setae on both rami.  Telsondeeply cleft, with dorsal robust setae, with 2 to 3 apical robust setae on each lobe.  Male(sexually dimorphic characters). Antennae 1 and 2calceoli present. Antenna 2peduncular articles 4 and 5 enlarged.   Remarks.When Pirlot first described this species he recognised its similarity to the species now known as  Photosella miersibut noted the lack of a ridge on coxa 5 of Stebbing's species.  Photosella mucronatadiffers from  P. miersiin having a ridge on the coxa of pereopod 5. In Australiait is currently known only from the North West Shelf of Western Australia.   Distribution.Eastern Indonesiaand north-western Australia, 39–141 mdepth. [151,1350,355,380] Guinea-Bissau 141 0.052222222 North-west of Waigeo Island 925 130.4 West New 11 12 1 holotype 1983-04-22 AM 42 -19.94 126 117.895 11 12 2 1 1 1983-04-22 AM 43 -19.94 126 117.89667 11 12 6 1983-04-27 1983-06-25 1983-04-27 AM 82 -19.946667 126 117.89333 11 12 1 1983-06-25 AM 44 -19.94 126 117.89833 11 12 3 1983-08-26 AM 44 -19.938334 126 117.89833 11 12 1 1 1983-10-26 AM 41 -19.94 126 117.9 11 12 1 1 1983-10-25 AM 39 -19.49 127 118.875 11 12 1 1 1983-10-25 AM 41 -19.498333 127 118.85 11 12 1 1 1983-10-23 AM 82 -19.078333 127 118.78667 11 12 1 1