Lepidepecreum tourville Lowry &amp; Stoddart, 2002, n.sp.
Creators: name: Lowry, J. K.
name: Stoddart, H. E.
Publisher: name: Zenodo
Year: 2002
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Tryphosidae
Lepidepecreum
Lepidepecreum tourville

description: <i>Lepidepecreum tourville</i> n.sp. Figs. 23–25 <b>Type material</b>. HOLOTYPE, female, ovigerous (9 eggs), 5.8 mm, NMV J47730; 1 PARATYPE, male, 5.6 mm, NMV J17159; 3 PARATYPES, (2 ovigerous females, 1 immature), AM P57739; 48 km ENE Cape Tourville, Tasmania, Australia, 42°00.25'S 148°43.55'E to 41°57.77'S 148°42.08'E, 1264– 1130 m, gravel with lumps of sandy mud aggregate, WHOI epibenthic sled, G.C.B. Poore <i>et al</i>., 30 October 1988, RV <i>Franklin</i> stn SLOPE 81. —1 PARATYPE, immature, NMV J47731, S of Point Hicks, Victoria, Australia, 38°25.90'S 148°58.60'E, 1850 m, muddy, sandstone, WHOI epibenthic sled, G.C.B. Poore <i>et al</i>., 22 July 1986, RV <i>Franklin</i> stn SLOPE 25. —1 PARATYPE, ovigerous female, NMV J47732, S of Point Hicks, Victoria, Australia, 38°25.00'S 149°0.00'E, 1500 m, compacted clay, WHOI epibenthic sled, G.C.B. Poore <i>et al</i>., 22 July 1986, RV <i>Franklin</i>, stn SLOPE 27. 1 PARATYPE, female, NMV J47733, ESE of Nowra, NSW, Australia, 54 km 34°52.72'S 151°15.04'E, 996 m, mud, fine sand, fine shell, WHOI epibenthic sled, G.C.B. Poore <i>et al</i>., 22 October 1988, RV <i>Franklin</i> stn SLOPE 53. <b>Type locality</b>. 48 km ENE of Cape Tourville, Tasmania, Australia, 42°00.25'S 148°43.55'E to 41°57.77'S 148°42.08'E, 1264– 1130 m depth. <b>Description</b>. Based on holotype female, 5.8 mm. Body expanded to form a lateral bulge. Head with lateral cephalic lobe semidome, apically subacute. <i>Antenna 1 peduncular article 1 with well-developed anterodistally subacute lobe; article 2 without anterodistal lobe;</i> accessory flagellum 2- articulate; flagellum with weak 1-field callynophore; robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 elongate; flagellum short, calceoli absent. Epistome/upper lip with epistome produced beyond upper lip, broadly rounded. Mandible molar columnar with oval, fully triturating surface; mandibular palp attached proximally, article 3 without proximal A3-setae. Maxilla 1 outer plate with left and right setal-tooth 7 asymmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped outer plate with 1 short, slender apical robust seta. <i>Gnathopod 1</i> subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; <i>basis moderately setose along anterior margin</i>; ischium short; carpus long, subequal in length to propodus, without posterior lobe; propodus with margins subparallel, <i>palm acute, entire, straight. Gnathopod 2 palm obtuse</i>. <i>Pereopod 4 coxa without distinct lateral ridge</i>, with a well-developed posteroventral lobe. <i>Pereonite 5 dorsally smooth. Pereopod 5 coxa without distinct lateral ridge, without umbo, basis about as long as broad</i>. <i>Pereopod 7 basis posterodistally produced less than halfway along merus</i>. <i>Pleonite 1</i> with mid-dorsal carina, <i>acutely produced posterodistally. Pleonite 2</i> with mid-dorsal carina, <i>acutely produced posterodistally</i>. Pleonite 3 with mid-dorsal carina, <i>produced dorsodistally, apically acute, posterodorsal margin produced. Epimeron 3</i> posterior margin smooth, <i>posteroventral corner subquadrate.</i> Urosomite 1 projecting over urosomite 2, dorsodistally acute. <i>Uropod 3 inner and outer rami well developed; outer ramus article 2 short</i>; without plumose setae on rami. <i>Telson moderately or slightly cleft</i>, with dorsal robust setae, with 1 apical robust seta on each lobe. <b>Male</b> (sexually dimorphic characters). Based on paratype male, 5.6 mm.Antenna 2 flagellum elongate, calceoli absent. Uropod 3 with plumose setae on each ramus. The only male specimen available for this species is not fully mature; although antenna 2 is long, another moult can be seen inside. The final male stage may develop calceoli. <b>Etymology</b>. Named for Cape Tourville, near the type locality. <b>Remarks</b>. <i>Lepidepecreum tourville</i> is the only Australian species of <i>Lepidepecreum</i> without a greatly produced basis on pereopod 7. However it does have an anterodistal lobe on peduncular article 1, but not on article 2 and it has dorsodistally produced pleonites 1 to 3, a combination of characters which also occurs in the group of taxa with a large basis on pereopod 7. In fact <i>L. tourville</i> appears to be most similar to <i>L. clypodentatum</i>. They differ mainly in the dorsodistal lobe of antenna 1, which is more rounded in <i>L. clypodentatum</i>, and in the development of the basis of pereopod 7. <b>Distribution</b>. Southeastern Australia, Tasman Sea; 996– 1850 m depth.
description: Published as part of <i>Lowry, J. K. &amp; Stoddart, H. E., 2002, The Lysianassoid Amphipod Genera Lepidepecreoides and Lepidepecreum in Southern Waters (Crustacea: Lysianassidae: Tryphosinae), pp. 335-364 in Records of the Australian Museum 54 (3)</i> on pages 360-363, DOI: 10.3853/j.0067-1975.54.2002.1329