The genus Hippomedon in Australian waters (Crustacea, Amphipoda, Lysianassidae, Tryphosinae) Author Kilgallen, N. M. Author Lowry, J. K. text Zootaxa 2015 3926 3 377 395 journal article 10.11646/zootaxa.3926.3.4 0f42809f-7f45-47a2-b410-f35b38ea337e 1175-5326 232363 96CC7DD1-4B40-4F28-8125-5651DFC6CDE2 Hippomedon rodericki Moore, 1989 ( Figs 8–10 ) Hippomedon rodericki Moore, 1989 : 1444 , figs 1–3.— Lowry & Stoddart, 2003 : 166 . Types . Holotype male, 8.5 mm , AM P.39389. Type locality. Tasmania, off Burnie ( 41°02'S 146°00'E ), circa 15 m , stones & sand, April 1986 , Marine Ecological Surveys Ltd, Faversham, Kent, sample no. 29. Additional material examined. New South Wales . 1 female , AM P.69717, Botany Bay ( 33°59.33'S 151°12.66'E ), 10 m , 16 January 1975 , NSW State Fisheries [BB-817]; 1 male , AM P.69718, Botany Bay ( 33°58.83'S 151°11.75'E ), 6 m , 12 February 1975 , NSW State Fisheries [BB-864]; 1 specimen , AM P.41957, Botany Bay, south of airport runway extension ( 33°58.13'S 151°11.16'E ), 5 m , Smith-McIntyre Grab, 6–7 April 1992 , Australian Museum party [NSW-767]; 2 specimens , AM P.44302, off Wollongong ( 34°26.53'S 150°57.98'E ), 50 m , baited trap, Globigerina ooze, 27–28 March 1994 , J.K. Lowry & K. Dempsey, MV Robin E [NSW-939]; 3 specimens , AM P.44314, off Wollongong ( 34°26.53'S 150°57.98'E ), 50 m ,baited trap, Globigerina ooze, 27–28 March 1994 , J.K. Lowry & K. Dempsey, MV Robin E [NSW-940]; 2 specimens , AM P.44332, off Wollongong ( 34°26.53'S 150°57.98'E ), 50 m ,baited trap, Globigerina ooze, 28–29 March 1994 , J.K. Lowry & K. Dempsey, MV Robin E [NSW-958]; 5 specimens , AM P.48426, north-east of Coffs Harbour ( 30°15.93'S 153°21.9'E ), 100 m , baited trap, 9–10 September 1994 , J.K. Lowry & K. Dempsey, MV Carrie Ann [NSW-1006]; 2 specimens , AM P.55973, north-east of Coffs Harbour ( 30°15.75'S 153°21.98'E ), 98 m ,baited trap, 12–13 August 1993 , P.B. Berents, R.T. Springthorpe & W. Vader, MV Cheryl Lee [NSW-885]; 1 male , AM P.69712, east of Long Reef Point ( 33°46'S 151°43'E ), 176 m , dredge, 5 December 1977 , FRV Kapala [K 77-23-01 ]; 4 specimens , AM P.69713, east of Long Reef Point ( 33°46'S 151°43'E ), 176 m , dredge, 0 5 December 1977 , FRV Kapala [K 77-23-01 ]; 2 specimens , AM P.69714, east of Broken Bay (33°35–34'S 151°41'E ), 135 m , 10 February 1986 , FRV Kapala [K 86- 01-03 ]; 1 female , AM P.69715, east of Long Reef (33°43–44'S 151°46'E ), 174 m , epibenthic sled, 20 December 1985 , J.K. Lowry & R.T. Springthorpe, FRV Kapala [K 85-21-08 ]; 7 specimens , AM P.69716, east of Long Reef (33°43–44'S 151°46'E ), 174 m , epibenthic sled, 20 December 1985 , J.K. Lowry & R.T. Springthorpe, FRV Kapala [K 85-21-08 ]; 1 specimen , AM P.69719, off coast (33°50', 151°20'E ), 73–183 m , from stomach of Jackass Fish ( Nemadactylus macropterus ), July 1939 , A.C.S.; 1 female , AM P.69720, Bass Point ( 34°36'S 150°54'E ), 45–50 m , Smith-McIntyre Grab, 29 October 1990 – 14 Nov 1990 , The Ecology Lab for RMI /Pioneer Project [3-27]; 1 specimen , AM P.69721, Bass Point ( 34°36'S 150°54'E ), 35–40 m , Smith-McIntyre Grab, 3–18 January 1991 , The Ecology Lab for RMI /Pioneer Project [4-213]; 1 specimen , AM P.69722, Bass Point ( 34°36'S 150°54'E ), 25–30 m ,Smith-McIntyre Grab, 1 February 1990 , The Ecology Lab for RMI /Pioneer Project [S1R1]; 1 specimen , AM P.69723, Wattamolla, off Providential Head ( 34°08'S 151°08.5'E ), 35–40 m , Smith-McIntyre Grab, 15 January 1990 , The Ecology Lab for RMI /Pioneer Project [W 9]; 1 specimen , AM P.83395, Jervis Bay ( 35°01.13'S 150°45.6'E ), 14 m , Van Veen Grab, 24 June 2008 , Geoscience Australia , M. McArthur, HMAS Kimbla [GA0312/ JB_45]; 1 specimen , AM P.22007, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 24 January 1973 , Australian Museum Shelf Benthic Survey [III]; 4 specimen , AM P.22008, 1.6 km east of Malabar sewage outlet ( 33°58.25’S 151°17’E ), 66 m , 26 June 1973 , Australian Museum Shelf Benthic Survey [III]; 1 specimen , AM P.22009, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 26 March 1973 , Australian Museum Shelf Benthic Survey [Stn III]; 1 specimen , AM P.22010, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 31 July 1973 , Australian Museum Shelf Benthic Survey [Stn. III]; 2 specimen , AM P.22011, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 23 May 1973 , Australian Museum Shelf Benthic Survey [III]; 1 specimen , AM P.22012, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 19 April 1973 , Australian Museum Shelf Benthic Survey [III]; 1 specimen , AM P.22013, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 26 March 1973 , Australian Museum Shelf Benthic Survey [Stn III]; 5 specimen , AM P.22014, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 30 August 1973 , Australian Museum Shelf Benthic Survey [Stn. III]; 1 specimen , AM P.22015, 1.6 km east of Malabar sewage outlet ( 33°58.25'S 151°17'E ), 66 m , 24 September 1973 , Australian Museum Shelf Benthic Survey [III]; 2 specimen , AM P.22016, 2 km east of Long Bay ( 33°58.33'S 151°17.82'E ), 127 m , 24 April 1973 , Australian Museum Shelf Benthic Survey [IV]; 1 specimen , AM P.22017, 2 km east of Long Bay ( 33°58.33'S 151°17.82'E ), 127 m , 27 September 1973 , Australian Museum Shelf Benthic Survey [IV]; 1 specimen , AM P.22018, 2 km east of Long Bay ( 33°58.33'S 151°17.82'E ), 127 m , 22 August 1973 , Australian Museum Shelf Benthic Survey [IV]; 1 specimen , AM P.22019, 2 km east of Long Bay ( 33°58.33'S 151°17.82'E ), 127 m , 5 December 1973 , Australian Museum Shelf Benthic Survey [IV]; 1 specimen , AM P.22020, 2.3 km south-east of Malabar ( 33°58.45'S 151°18.68'E ), 134 m , 26 January 1974 , Australian Museum Shelf Benthic Survey [V]; 1 specimen , AM P.22021, 2.3 km south-east of Malabar ( 33°58.45'S 151°18.68'E ), 134 m , 26 April 1973 , Australian Museum Shelf Benthic Survey [V]; 1 specimen , AM P.22022, 2.3 km south-east of Malabar ( 33°58.45'S 151°18.68'E ), 134 m , 24 Oct 1973 , Australian Museum Shelf Benthic Survey [V]; 3 specimen , AM P.22023, 2.3 km south-east of Malabar ( 33°58.45'S 151°18.68'E ), 134 m , August 1973 , Australian Museum Shelf Benthic Survey [V]; 1 specimen , AM P.22024, 2.3 km south-east of Malabar ( 33°58.45’S 151°18.68’E ), 134 m , 30 March 1973 , Australian Museum Shelf Benthic Survey [V]; 2 specimen , AM P.22025, east of Malabar ( 33°58.76'S 151°17.05'E ), 66 m , 19 February 1973 , Australian Museum Shelf Benthic Survey [Stn. 26]; 1 specimen , AM P.22026, east of Malabar ( 33°57.92'S 151°18.06'E ), 75 m , 20 February 1973 , Australian Museum Shelf Benthic Survey [Stn. 31]; 1 specimen , AM P.22031, 2km east of Magic Point ( 33°57.66'S 151°16.86'E ), 39 m , medium sand bottom with shell fragments, 17 May 1972 , Australian Museum Shelf Benthic Survey [D2]; 1 specimen , AM P.22032, east of Malabar ( 33°58.16'S 151°17.16'E ), 68 m , 21 February 1973 , Australian Museum Shelf Benthic Survey [Stn. 32]; 1 specimen , AM P.24046, 1.5 km east of Belmont Beach ( 33°02.6'S 151°40.93'E ), 23 m , 18 March 1975 , Australian Museum Hunter District Water Board Survey [ HDWBS 09010301]; 1 specimen , AM P.24047, 1.5 km east of Burwood Beach ( 32°57.52'S 151°44.72'E ), 28 m , mud with gravel, 16 December 1975 , Australian Museum Hunter District Water Board Survey [ HDWBS 06010304]. Tasmania. 1 specimen , AM P.51087, east of Fortescue Bay ( 43°06.7'S 148°13.6'E ), 200 m , baited trap, 17–18 April 1993 , J.K. Lowry & P. Freewater, MV Tasmanian Enterprise [TAS-374]; 5 specimens , AM P.69635, off Babel Island ( 39°55'S 148°31'E ), 25 m over bottom depth 51 m , horizontal plankton haul, 20 January 1939 , CSIRO , FRV Warreen [29/39]; 1 specimen , NMV J67795 , central Bass Strait, 6 km north-east of Stanley ( 40°48.8'S 145°22'E ), 22 m , fine sand, 4 November 1980 , M. Gomon & G.C.B. Poore, FRV Sarda [BSS-114]; 1 specimen , NMV J2431, Robbins Island , 5 km east of Cape Edie ( 40°41.8'S 145°07'E ), 16 m , fine shelly sand, epibenthic sled, 3 November 1980 , M. Gomon & G.C.B. Poore, FRV Sarda [BSS-110S]. FIGURE 8. Hippomedon rodericki P.G. Moore, 1989 , male, 13.5 mm, AM P.69718, from Botany Bay, New South Wales. Victoria. 1 specimen , NMV J3297, Port Phillip Bay, Hobsons Bay ( 37°51’S 144°56’E ), 10.3 m , Smith- McIntyre grab, February 1975 – January 1986 , G.C.B. Poore & S.F. Rainer [ PBES 137]; 1 male , NMV J67796 , western Bass Strait, 32 km south-south-west of Cape Otway, ( 39°09'S 143°26'E ), 85 m , coarse carbonate sand, dredge, 8 October 1980 , G.C.B. Poore, HMAS Kimbla [BSS-55D]; 1 specimen , NMV J67797 , central Bass Strait, 100 km south-south-east of Cape Liptrap ( 39°45.9'S 145°33.5'E ), 74 m , muddy fine sand, epibenthic sled, 13 November 1981 , R. Wilson, RV Tangaroa [BSS-156S]; 2 specimens , NMV J67798 , eastern Bass Strait, 50 km south-west of Lakes Entrance ( 38°03'S 147°50'E ), 45 m , epibenthic sled, 31 July 1983 , M. Gomon & R. Wilson, FV Silver Gull [BSS-212S]; 1 male , NMV J67799 , western Bass Strait, 31 km south-south-west of Cape Otway ( 39°08'S 143°24'E ), 77 m , medium sand, 8 October 1980 , Smith-McIntyre grab, G.C.B. Poore, HMAS Kimbla [stn BSS-56G]; 16 specimens , NMV J67800 , western Bass Strait, 26 km south-west of Cape Otway ( 39°01.0'S 143°22.1'E ), 84 m , medium sand, dredge, 31 January 1981 , M. Gomon et al., FRV Hai Kung [BSS-120D]; 1 specimen , NMV J67801 , western Bass Strait, 25 km east-south-east of Cape Otway ( 39°59'S 143°47'E ), 81 m , sand, Smith-McIntyre grab, 7 October 1980 , G.C.B. Poore, HMAS Kimbla [BSS-49G]; 1 specimen , NMV J67802 , central Bass Strait, 25 km south of Aireys Inlet ( 38°44.6'S 144°09.0'E ), 77 m , fine sand, Smith-McIntyre grab, 19 November 1981 , R. Wilson, RV Tangaroa [BSS-182G]; 1 specimen , NMV J67803 , western Bass Strait, 15 km south-west of Point Reginald ( 38°50.0'S 143°07.5'E ), 69 m , fine sand, 20 November 1981 , R. Wilson, RV Tangaroa [BSS-186]; 3 specimens , NMV J67804 , western Bass Strait, 70 km south-west of Cape Otway ( 39°26.3'S 143°06.8'E ), 115 m , sand, epibenthic sled, 21 November 1981 , R. Wilson, RV Tangaroa [BSS-194S]; 8 specimens , NMV J2432, western Bass Strait, 25 km south of Cape Otway ( 39°06'S 143°35.8'E ), 95 m , fine sand, 31 January 1981 , M. Gomon et al., FRV Hai Kung [BSS-118]. FIGURE 9. Hippomedon rodericki P.G. Moore, 1989 , ovigerous female, 15.2 mm, AM P.69717; male, 13.5 mm, AM P.69718, both from Botany Bay, New South Wales. Scale bars: 0.2 mm. FIGURE 10. Hippomedon rodericki P.G. Moore, 1989 , ovigerous female, 15.2 mm, AM P.69717, from Botany Bay, New South Wales. Scale bars: 0.5 mm. Description. Based on ovigerous female, 15.2 mm , AM P.69717. Head , lateral cephalic lobe subtriangular, apically subacute. Antenna 1 peduncular article 1 without anterodistal lobe; article 2 without anterodistal lobe; accessory flagellum present, not forming cap, 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; flagellum long, calceoli absent. Labrum (epistome and upper lip) separate; epistome produced equally with upper lip, slightly rounded; upper lip not produced. Mandible molar columnar, with subcircular fully triturating surface. Maxilla 1 inner plate with 1 large apical pappose seta and 7 smaller pappose setae along inner margin;outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally along inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 1 long, slender apical robust setae. Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis moderately setose along anterior margin; ischium short; carpus long (length 3.0 × width), longer than propodus, without posterior lobe; propodus small, margins subparallel, sparsely setose along posterior margin, palm moderately acute, entire, straight. Gnathopod 2 propodus palm slightly acute and concave . Pereopod 4 coxa posteroventral lobe well-developed. Pereopod 5 coxa without distinct lateral ridge, basis about as long as broad, not posteroproximally excavate, posterior margin weakly 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. Epimeron 2 posteroventral corner producing small spine. Epimeron 3 posterior margin smooth, posteroventral corner produced into strong spine with notch at base . Urosomite 1 not projecting over urosomite 2, dorsally straight. Uropod 2 rami subequal in length, inner ramus without constriction. Uropod 3 slender; peduncle without dorsolateral flange; inner and outer rami well developed, outer ramus article 2 short, with plumose setae on both rami . Telson deeply cleft, with 2 or 3 dorsal robust setae per lobe, and 1 apical robust seta on each lobe . Sexually dimorphic characters. Based on male, 13.5 mm , AM P.69718. Antenna 1 flagellum calceoli present, small. Antenna 2 peduncular article 3 short; articles 3 to 5 not enlarged; flagellum long, calceoli present. Uropod 3 slender; peduncle without dorsolateral flange; inner and outer rami well developed, outer ramus article 2 short, with plumose setae on both rami, more developed than the female. Depth range. 5– 200 m . Remarks. Moore (1989) described the male holotype as lacking calceoli on the antennae. With more material available to us, we confirm that males do have small calceoli on both antenna 1 and 2. The extent of the excavation on the palm of gnathopod 2 seems to be variable from weakly to strongly concave. Distribution. Australia . Eastern and south-eastern coasts from Coffs Harbour, New South Wales , to Fortescue Bay, Tasmania, and Bass Strait.