Sophrosyne abyssi Lowry &amp; Stoddart 2010, sp. nov.
Creators: name: Lowry, J. K.
name: Stoddart, H. E.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Sophrosynidae
Sophrosyne
Sophrosyne abyssi

description: <i>Sophrosyne abyssi</i> sp. nov. (Figs 1 –3) <b>Type material</b>. HOLOTYPE, female, 5.0 mm, with long non-setose oostegites, AM P.48883, east of Cape Naturaliste, Tasmania, Australia (40°45.94'S 149°01.62'E to 40°46.54'S 149°00.27'E), 2400–2500 m, light grey clay and mud, epibenthic sled, R. T. Springthorpe, 10 December 1986, RV <i>Franklin</i> (stn FR 1086-04). <b>Type locality.</b> East of Cape Naturaliste, Tasmania, Australia (40°45.94'S 149°01.62'E to 40°46.54'S 149°00.27'E), 2400–2500 m. <b>Etymology</b>. The specific name refers to the great depth from which the type specimen was obtained. <b>Diagnostic description</b>. <i>Head</i> lateral cephalic lobe small, narrowly rounded; eyes apparently absent. <i>Antenna 1</i> peduncular article 1 short, length 1.4 x breadth; accessory flagellum medium length, 0.52 x primary flagellum, article 1 short, 0.8 x article 2; flagellum 7-articulate, without callynophore. <i>Antenna 2</i> peduncular article 3 0.6 x article 4; flagellum 7-articulate. <i>Mandible</i> incisors with slightly convex margins; <b>palp article 2 slender</b>, 1.2 x article 3, <b>with 1 submarginal posterodistal A2-seta, without D2-setae</b>, article 3 length 3.8 x breadth, without D3-setae, with 4 apical E3-setae. <b> <i>Maxilla 1</i> outer plate with setal-teeth in a 2/3 arrangement</b> . <i>Maxilla 2</i> inner plate narrow, outer plate broader; inner plate length 0.6 x outer plate. <i>Maxilliped</i> inner plate subrectangular, without apical nodular robust setae; outer plate submarginal setae long, simple; <b>palp article 2 broad</b>, length 1.8 x breadth, 1 x article 3, article 3 slender, length 2.5 x breadth, dactylus with unguis vestigial. <i>Gnathopod 1</i> basis length 1.5 x breadth, <b>anterior margin without setae</b>; ischium length 1.3 x breadth; <b>merus, posterior margin with a few slender setae</b>; carpus length 0.5 x propodus; propodus length 1.6 x breadth, posterior margin slightly concave, with robust setae and simple, slender setae, <b>palm margin sinusoidal</b>, posterodistal corner with produced subacute spine bearing vestigial seta. <i>Gnathopod 2</i> minutely subchelate; ischium length 2.5 x breadth; carpus long, length 3.3 x breadth, posterior margin straight; propodus subrectangular, short, length 1.8 x breadth; palm acute, with convex, smooth margin. <i>Pereopod 3</i> merus weakly expanded anteriorly. <i>Pereopod 4</i> merus weakly expanded anteriorly. <i>Pereopod 5</i> basis moderately expanded posteriorly; merus moderately expanded posteriorly. <i>Pereopod 6</i> coxa small, slightly lobate posteriorly; merus slightly expanded posteriorly. <i>Pereopod 7</i> basis posterior margin slightly rounded, minutely crenate, posteroventral margin rounded, posteroventral lobe not extending beyond ischium; merus slightly expanded posteriorly; propodus with setae along anterior margin. <i>Epimeron 3</i> posterior margin with strong upturned spine above subquadrate posteroventral corner. <b> <i>Urosomite 1</i> with anterodorsal notch and rounded boss</b> , without lateral flange. <i>Uropod 1</i> rami subequal in length; outer ramus with 2 dorsal robust setae; inner ramus with 1 dorsal robust seta. <i>Uropod 2</i> rami subequal in length; outer ramus with robust setae. <i>Uropod 3</i> peduncle length 1.3 x breadth; rami subequal in length. <i>Telson</i> longer than broad, length 1.3 x breadth, <b>deeply cleft</b> (67%), distal margins incised, with 1 apical slender seta on each lobe. <b>Remarks</b>. <i>Sophrosyne abyssi</i> has an angled posteroventral corner on epimeron 3 and a deeply cleft telson similar to <i>S. ledoyeri</i>. These taxa differ in the length of mandibular palp article 2, the presence of D3-setae on article 3 in <i>S. abyssi</i>, the setal-tooth arrangement on the outer plate of maxilla 1, the shape of maxillipedal palp article 2, the setation of the posterodistal corner of gnathopod 1 and the length of the telson. <i>Sophrosyne abyssi</i> shares an angled posteroventral corner on epimeron 3 and a shallow posteroventral lobe on pereopod 7 with <i>S. inverarae</i> and <i>S. murrayi</i>, but differs from both of these species in the maxilla 1 setal-tooth arrangement and in the shape of the gnathopod 2 palm. <b>Distribution</b>. East of Tasmania, Australia, in 2400–2500 m depth.
description: Published as part of <i>Lowry, J. K. &amp; Stoddart, H. E., 2010, Sophrosynidae, a new family in the Lysianassoidea (Crustacea: Amphipoda) with a revision of the genus Sophrosyne, pp. 1-35 in Zootaxa 2370 (1)</i> on pages 5-6, DOI: 10.11646/zootaxa.2370.1.1, http://zenodo.org/record/5306939