The Tryphosa group (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae) Author Kilgallen, N. M. Author Lowry, J. K. text Zootaxa 2014 2014-02-28 3768 5 501 545 journal article 5767 10.11646/zootaxa.3768.5.1 4c0b59ec-84a8-4daa-8467-3ac34e86ecd6 1175-5326 4909684 FACF814C-3221-44CF-9DED-4B808F186C64 Pseudonesimus robustus (J.L. Barnard, 1961 ) comb. nov. ( Figs 6–8 ) Ambasiopsis robustus J.L. Barnard, 1961: 30 , fig. 1. Schisturella robusta .―J.L. Barnard, 1966: 71 (key).― Barnard & Karaman, 1991: 527 .― Larsen, 2007: 14 (key). Schisturella robusta robusta .―J.L. Barnard, 1967: 72 (key).― Barnard & Ingram, 1990: 31 (key).― Barnard & Karaman, 1991: 527 .― Hendrycks & Conlan, 2003: 2333 , fig. 13. Types . Holotype , male, 10 mm , ZMUC CRU-1976 . Type locality. Off Fiordland , South Island , New Zealand ( 44º18'S 166º46'E ), clay, 3580 m depth . Material examined. 1 female , 9.0 mm, NMV J46957 , from off Freycinet Peninsula , Tasmania , Australia ( 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 stn slope 46 ; 6 specimens , NMV J46958 , from off Freycinet Peninsula , Tasmania , Australia ( 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 stn slope 46 ; 4 specimens , NMV J46959 , from off Freycinet Peninsula , Tasmania , Australia ( 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 stn slope 45 ; 1 specimen , NMV J46960 , from off Freycinet Peninsula , Tasmania , Australia ( 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 stn slope 45 . Description. Based on female, 9.0 mm, NMV J46957 . Head lateral cephalic lobe subtriangular, apically subacute; eyes apparently absent. Antenna 1 peduncular article 1 without anterodistal lobe; article 2 without anterodistal lobe; accessory flagellum present, forming cap partially covering callynophore, terminal article not offset; flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short, articles 3 to 5 not enlarged, articles 4–5 with brush setae on the anterior margin; flagellum short, calceoli absent. Epistome/upper lip separate; epistome less produced than upper lip, straight; upper lip produced, rounded apically . Mandible molar with reduced column and convex strongly triturating surface. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, not cuspidate; palp distal margin with apical robust setae. Maxilliped basis without recurved hook; outer plate with 2 long, broad apical robust setae. FIGURE 6. Pseudonesimus robustus (J.L. Barnard, 1961 ) , female habitus , 9.0 mm, NMV J46957 . FIGURE 7. Pseudonesimus robustus (J.L. Barnard, 1961 ) , female, 9.0 mm, NMV J46957 , from off the Freycinet Peninsula, Tasmania, Australia. Scale bars: 0.2 mm. Pereonites 1–7 dorsally smooth. Gnathopod 1 slightly chelate; coxa reduced, significantly shorter than coxa 2, subquadrate; basis moderately setose along anterior margin; ischium short; carpus short, subequal in length to propodus, without posterior lobe; propodus small, sparsely setose along posterior margin, slightly obtuse, entire, straight. Gnathopod 2 propodus palm transverse. Pereopod 4 coxa without distinct lateral ridge. Pereopod 5 coxa without distinct lateral ridge, without umbo; basis longer than broad, without photophore, not posteroproximally excavate, posterior margin not serrate, posterior margin without mid-central spine, without posteroventral lobe or spine. Pereopod 7 basis posterodistally produced less than halfway along merus, not posterodistally excavate. FIGURE 8. Pseudonesimus robustus (J.L. Barnard, 1961 ) , female, 9.0 mm, NMV J46957 , from off the Freycinet Peninsula, Tasmania, Australia. Scale bars: 0.2 mm. Pleonites 1–3 without mid-dorsal carina, not produced dorsodistally. Epimeron 3 posterior margin smooth, posteroventral corner narrowly rounded . Urosomite 1 n ot projecting over urosomite 2, dorsally straight. Uropod 2 inner ramus with constriction. Uropod 3 stout; peduncle without dorsolateral flange; inner and outer rami well developed, outer ramus article 2 short, without plumose setae on rami. Telson moderately cleft, with dorsal robust setae per lobe, with 2 tiny apical robust setae on each lobe. Sexually dimorphic characters. None known. Depth range. 720–3580 m (J.L. Barnard 1961 ; this study). Remarks. This is the first record of this species in Australian waters. It has previously been recorded from the west coast of the New Zealand South Island. Distribution . South Pacific Ocean. Tasman Sea: southwest coast of New Zealand (J.L. Barnard 1961 ); east coast of Tasmania (this study).