Sophrosyne peartae 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 peartae

description: <i>Sophrosyne peartae</i> sp. nov. (Figs 14–16) <b>Type material</b>. HOLOTYPE, female, 4.6 mm, ovigerous (3 eggs), MV J60733, south of Point Hicks, Victoria, Australia (38°19.10'S 149°14.30'E), 600 m, coarse sand, epibenthic sled, M.F. Gomon on RV <i>Franklin</i>, 24 July 1986 (stn SLOPE 39). <b>Type locality.</b> South of Point Hicks, Victoria, Australia (38°19.10'S 149°14.30'E), 600 m. <b>Etymology</b>. This species is named for Rachael Peart, who illustrated many of our amphipods and found morphological characters we had not noticed. <b>Diagnostic description</b>. <i>Head</i> lateral cephalic lobe small, narrowly rounded; eyes oval. <i>Antenna 1</i> peduncular article 1 short, length 1.4 x breadth; accessory flagellum long, 0.5 x primary flagellum, article 1 short, 0.9 x article 2; flagellum 7-articulate, without callynophore. <i>Antenna 2</i> peduncular article 3 0.5 x article 4; flagellum 7-articulate. <i>Mandible</i> incisors with straight margins; <b>palp article 2 slender</b>, 1 x article 3, with 1 submarginal posterodistal A2-seta, without D2-setae, <b>article 3</b> length 6.2 x breadth, <b>without D3-setae</b>, and/ with 4 apical E3-setae. <b> <i>Maxilla 1</i> outer plate with setal-teeth in a 2/4 arrangement</b> . <i>Maxilliped</i> inner plate subrectangular, without apical nodular robust setae; outer plate submarginal setae long, simple; palp article 2 slender, length 2.2 x breadth, 1.1 x article 3, article 3 slender, length 2.5 x breadth, dactylus with unguis absent. <i>Gnathopod 1</i> basis length 1.7 x breadth, anterior margin with slender setae; ischium length 1.4 x breadth; merus, posterior margin lined with long slender setae; carpus length 0.5 x propodus; propodus length 1.8 x breadth, posterior margin slightly concave, with robust setae, <b>palm margin sinusoidal</b>, posterodistal corner with produced subacute spine bearing vestigial seta. <b> <i>Gnathopod 2</i> grossly subchelate in female,</b> [not known for male]; ischium length 2.9 x breadth; carpus long, length 2.4 x breadth, posterior margin broadly lobate; <b>propodus subrectangular</b>, short, length 1.8 x breadth; <b>palm</b> acute, <b>with large, concave</b>, smooth <b>margin</b>. <i>Pereopod 3</i> merus not expanded anteriorly. <i>Pereopod 4</i> merus not expanded anteriorly. <i>Pereopod 5</i> basis moderately expanded posteriorly; merus slightly expanded posteriorly. <i>Pereopod 6</i> coxa small, slightly lobate posteriorly; merus slightly expanded posteriorly. <b> <i>Pereopod 7</i> basis posterior margin almost straight, scalloped</b> , posteroventral margin straight, posteroventral lobe not extending beyond ischium; merus not expanded posteriorly; propodus with setae along anterior margin. <b> <i>Epimeron 3</i> posterior margin with strong upturned spine above rounded posteroventral corner</b> . <i>Urosomite 1</i> with anterodorsal notch and rounded boss, with lateral flange. <i>Uropod 1</i> outer ramus slightly longer than inner ramus; outer ramus with 2 dorsal robust setae; inner ramus without dorsal robust setae. <i>Uropod 2</i> rami subequal in length; rami without robust setae. <i>Uropod 3</i> peduncle length 1.5 x breadth. <i>Telson</i> longer than broad, length 1.2 x breadth, moderately cleft (50%), distal margins rounded, with1 apical slender seta on each lobe. <b>Remarks</b>. Only two species of <i>Sophrosyne</i>, <i>S. peartae</i> and <i>S. murrayi</i>, have a grossly expanded palm on gnathopod 2. They differ most noticeably in the shape of the propodus of gnathopod 2, (subquadrate in <i>S. murrayi</i> and subrectangular in <i>S. peartae</i>) and in the posteroventral corner of epimeron 3 (subquadrate in <i>S. murrayi</i> and rounded in <i>S. peartae</i>). <b>Distribution</b>. Slope off Bass Strait, Australia in 600 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 25-26, DOI: 10.11646/zootaxa.2370.1.1, http://zenodo.org/record/5306939