Sophrosyne antarctica Ren 1991

• Main Authors: Lowry, J. K., Stoddart, H. E.
• Format: Text
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Sophrosynidae; Sophrosyne; Sophrosyne antarctica; Antarctic; Southern Ocean; The Antarctic; Antarctic Peninsula; South Shetland Islands; Seta; Lowry; Palmer Archipelago; Antarc*; Antarctica; ren
• Online Access: https://dx.doi.org/10.5281/zenodo.5777796; https://zenodo.org/record/5777796

Sophrosyne antarctica Ren, 1991 Sophrosyne antarctica Ren in Ren & Huang, 1991: 249, 308, fig. 39. — De Broyer & Jazdzewski, 1993: 15, 75. — De Broyer et al ., 2007: 159. Type locality. South Shetland Islands, Southern Ocean (62°50.6'S 60°20.5'W), 860 m. Diagnostic description . Head lateral cephalic lobe small, narrowly rounded; eyes apparently absent. Antenna 1 peduncular article 1 short, length 1.3 x breadth; accessory flagellum long, 0.5 x primary flagellum, article 1 long, 2.6 x article 2; flagellum 7-articulate, without callynophore. Antenna 2 peduncular article 3 0.5 x article 4; flagellum 6-articulate. Mandible incisors with straight margins; palp article 2 slender, 1.1 x article 3, without A2-setae , without D2-setae, article 3 length 4.8 x breadth, without D3-setae, with 4 apical E3- setae. Maxilla 1 outer plate with setal-teeth in a 2/1 arrangement . Maxilla 2 inner plate narrow, outer plate broader; inner plate length 0.56 x outer plate. Maxilliped inner plate subrectangular, without apical nodular robust setae; outer plate submarginal setae absent; palp article 2 slender, length 2.4 x breadth, 1.1 x article 3, article 3 slender, length 2.4 x breadth, dactylus with unguis absent. Gnathopod 1 basis length x breadth unknown, anterior margin with slender setae; ischium length 1 x breadth; merus, posterior margin with a few slender setae carpus length 0.5 x propodus; propodus length 1.7 x breadth, posterior margin subtly sinusoidal , with simple, slender setae, palm margin straight, posterodistal corner with produced subacute spine bearing vestigial seta. Gnathopod 2 minutely subchelate; ischium length 3 x breadth; carpus long, length 3.5 x breadth, posterior margin straight; propodus subrectangular, long, length 2.5 x breadth; palm slightly acute, with concave, smooth margin. Pereopod 3 merus weakly expanded anteriorly. Pereopod 4 merus not expanded anteriorly. Pereopod 5 basis moderately expanded posteriorly; merus slightly expanded posteriorly. Pereopod 6 coxa small, not lobate posteriorly; merus expanded posteriorly. Pereopod 7 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. Epimeron 3 posterior margin with strong upturned spine above rounded posteroventral corner. Urosomite 1 with anterodorsal notch and rounded boss, without lateral flange. Uropod 1 outer ramus slightly longer than inner ramus. Uropod 2 rami subequal in length; rami without robust setae. Uropod 3 peduncle length 1.4 x breadth; rami subequal in length. Telson longer than broad, length 1.2 x breadth, moderately cleft (62%), distal margins rounded, with 1 apical slender seta on each lobe. Remarks . Sophrosyne antarctica shares with S. californica and S. cantractia a vestigial seta on the posterodistal corner of the gnathopod 2 propodus and a curved posteroventral corner with strong upturned tooth on epimeron 3. Sophrosyne antarctica differs from S. californica in the lack of A- and D-setae on the mandibular palp, in the arrangement of setal-teeth on the outer plate of maxilla 1 and in the presence of slender setae along the posterior margin of the propodus of gnathopod 1. It differs from the other Antarctic species, S. cantractia , in the lack of A- and D-setae on the mandibular palp, in the arrangement of setal-teeth on the outer plate of maxilla 1, in the slender maxillipedal palp article 2 and in the scarcity of slender setae along the posterior margin of the merus of gnathopod 1. Distribution . South Shetland Islands and Palmer Archipelago, Antarctica in 180–860 m depth. : Published as part of Lowry, J. K. & 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) on pages 8-9, DOI: 10.11646/zootaxa.2370.1.1, http://zenodo.org/record/5306939 : {"references": ["Ren, X. & Huang, L. (1991) [Studies on Gammaridea and Caprellidea (Crustacea: Amphipoda) from the northwest waters of the Antarctic Peninsula]. Studia Marina Sinica, 32, 187 - 323.", "De Broyer, C. & Jazdzewski, K. (1993) Contribution to the marine biodiversity inventory. A checklist of the Amphipoda (Crustacea) of the Southern Ocean. Documents de Travail de l'Institut Royal des Sciences Naturelles de Belgique, 73, 1 - 154.", "De Broyer, C., Lowry, J. K., Jazdzewski, K. & Robert, H. (2007) Catalogue of the Gammaridean and Corophiidean Amphipoda (Crustacea) of the Southern Ocean with distribution and ecological data. In: De Broyer C. (ed.). Census of Antarctic Marine Life. Synopsis of the Amphipoda of the Southern Ocean. Vol. 1. Bulletin de l'Institut royal des Sciences naturelles de Belgique, Biologie 77, Supplement 1, part 1, 1 - 325."]}