Tryphosella tuckanarra Lowry &amp; Stoddart 2011, sp. nov.
Creators: name: Lowry, J. K.
name: Stoddart, H. E.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Tryphosidae
Tryphosella
Tryphosella tuckanarra

description: <i>Tryphosella tuckanarra</i> sp. nov. (Figs 47–49) <b>Type material.</b> HOLOTYPE, female, ovigerous, 3.1 mm, AM P.70523, Vancouver Peninsula, near Mistaken Island, King George Sound, Western Australia, Australia, 35°04'S 117°56'E, 2 m, grey sponge with crinoids, 13 December 1983, R. T. Springthorpe, stn WA-114. PARATYPES: 1 immature, AM P.70524, same data as Holotype; 1 juvenile, AM P.70498, Vancouver Peninsula, near Mistaken Island, King George Sound, Western Australia, Australia, 35°04'S 117°56'E, 2 m, sponges, 13 December 1983, J.K. Lowry, stn WA-101; 1 male, 3.1 mm, AM P.70499, same data, stn WA-103; 4 specimens, AM P.70500, same locality, 2 m, soft corals and <i>Caulerpa</i>, 13 December 1983, J.K. Lowry, stn WA-106; 1 specimen, AM P.70525, same locality, 2 m, sponge covered with short green alga (? <i>Caulerpa</i>), 13 December 1983, R. T. Springthorpe, stn WA-119; 1 ovigerous female, 3.4 mm, AM P.70526 and 1 ovigerous female, AM P.70527, same locality, 6 m, sea grass, 13 December 1983, R. T. Springthorpe, stn WA-121. <b>Additional material examined.</b> <i>Western Australia</i>: 1 ovigerous female and 1 immature, AM P.70528, off Possession Point, King George Sound, 35°02.5'S 117°55'E, 7 m, mixed brown algae, bryozoans, sponge, R. T. Springthorpe &amp; J.K. Lowry, 14 December 1983, stn WA-133; 2 juveniles, AM P.70529, rocks near Migo Island, Port Harding, Torbay Bay, 35°04'S 117°39'E, 6–7 m, small branched alga with compound tunicate on underside of branches, 15 December 1983, R. T. Springthorpe &amp; J.K. Lowry, stn WA-152. <b>Type locality.</b> Vancouver Peninsular, near Mistaken Island, King George Sound, Western Australia, Australia, 35°04'S 117°56'E, 2 m depth. <b>Etymology.</b> Named for the tiny village of Tuckanarra located about about 580 km north-northeast from Perth. <b>Diagnostic description.</b> <i>Head</i> lateral cephalic lobe subtriangular, apically subacute; eyes apparently absent. <i>Antenna 1</i> peduncular articles 1 and 2 without anterodistal lobe; accessory flagellum not forming cap, terminal article not offset; flagellum with weak 2-field callynophore, robust setae absent from proximal articles; calceoli absent. <i>Antenna 2</i> peduncular article 3 short; articles 4 and 5 not enlarged; flagellum short, calceoli absent. <i>Epistome/Upper lip</i> epistome slightly produced beyond upper lip, narrowly rounded; upper lip slightly produced, straight. <i>Mandible</i> molar with asymmetrically reduced column, proximally setose, distally triturating; palp attached about midway, article 3 with proximal A3-seta. <i>Maxilla 1</i> outer plate setal-tooth 7 left and right asymmetrical, left cuspidate along most of sinusoidal inner margin, right cuspidate along most of curved inner margin; palp distal margin with apical robust setae. <i>Maxilliped</i> outer plate with 2 short apical robust setae. <i>Gnathopod 1</i> subchelate; <b>coxa medium length (length 1.5 x breadth), subtriangular, tapering distally</b>; basis moderately setose along anterior margin; ischium short; carpus long, subequal in length to propodus, without posterior lobe; propodus small, margins subparallel, sparsely setose along posterior margin, palm slightly acute, entire, straight. <i>Gnathopod 2</i> palm transverse. <i>Pereopod 4</i> coxa without distinct lateral ridge, with a well-developed posteroventral lobe. <i>Pereopod 5</i> coxa without distinct lateral ridge, without umbo; basis about as long as broad, not posteroproximally excavate, posterior margin not serrate. <i>Pereopod 7</i> basis posterodistally produced less than halfway along merus, not posterodistally excavate. <i>Pleonites 1–3</i> without mid-dorsal carina, not produced dorsodistally. <i>Epimeron 3</i> posterior margin smooth, <b>posteroventral corner subquadrate</b>. <i>Urosomite 1</i> not projecting over urosomite 2, <b>with rounded boss</b>. <i>Uropods 1 and 2</i> rami with distal stout striated robust setae. <i>Uropod 2</i> inner ramus without constriction. <i>Uropod 3</i> peduncle without dorsolateral flange, with 2 short apicomedial robust setae; inner and outer rami well developed, outer ramus article 2 short, without plumose setae on rami. <i>Telson</i> deeply cleft, with dorsal robust setae, with 1 apical robust seta on each lobe. <b>Male</b> (sexually dimorphic characters). <i>Antenna 1</i> calceoli present. <i>Antenna 2</i> flagellum long, calceoli present. Unfortunately a fully-developed male is not present in the collections. <b>Remarks.</b> <i>Tryphosella tuckanarra</i> is one of the group of six Australian species with stout striated robust setae on the outer rami of uropods 1 and 2 (see Remarks under <i>T. fortescue</i>). <i>Tryphosella tuckanarra</i> is very similar to <i>T. fortescue</i> in having a transverse palm on gnathopod 2, 2 short apicomedial robust setae on the peduncle of uropod 3 and 2 apical robust setae on each lobe of the telson. <i>Tryphosella tuckanarra</i> is distinguished from <i>T. fortescue</i> by the rounded lateral cephalic lobe (subtriangular in <i>T. fortescue</i>), the less reduced coxa 1 and the presence of 2 apical robust setae on the outer plate of the maxilliped (3 in <i>T. fortescue</i>). <i>Tryphosella tuckanarra</i> is known only from King George Sound and Torbay Bay in shallow-water. It has never been taken in traps. <b>Distribution.</b> South-western Western Australia, 2–7 m depth.
description: Published as part of <i>Lowry, J. K. &amp; Stoddart, H. E., 2011, The tryphosine genera Photosella gen. nov. and Tryphosella Bonnier, 1893 (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae) in Australian waters 2956, pp. 1-76 in Zootaxa 2956 (1)</i> on pages 66-70, DOI: 10.11646/zootaxa.2956.1.1, http://zenodo.org/record/5281859