Sophrosynidae, a new family in the Lysianassoidea (Crustacea: Amphipoda) with a revision of the genus Sophrosyne Author Lowry, J. K. Author Stoddart, H. E. text Zootaxa 2010 2010-02-25 2370 1 1 35 https://biotaxa.org/Zootaxa/article/view/zootaxa.2370.1.1 journal article 10.11646/zootaxa.2370.1.1 1175-5326 5306939 Sophrosyne integricauda sp. nov. ( Figs 8 , 9 ) Type material . HOLOTYPE , female, 3.2 mm , MV J60739 , 44 km north-east of Cape Wickham , King Island , central Bass Strait , Australia ( 39°22.0'S 144°18.3'E ), 60 m , coarse sand, grab, R. Wilson on RV Tangaroa , 23 November 1981 , cruise 81- T-1 (stn BSS-203) . PARATYPES : female, 3.4 mm , AM P.46682, same data;?female, 2.4 mm , male, 2.7 mm , MV J7447, 25 km west-south-west of Cape Otway , western Bass Strait , Australia ( 38°55'S 143°25'E ), 67 m , coarse sand, G.C.B. Poore on HMAS Kimbla , 8 October 1980 , cruise 80- K-1 (stn BSS-53) . Type locality. 44 km north-east of Cape Wickham , King Island , central Bass Strait , Australia ( 39°22.0'S 144°18.3'E ), 60 m . Etymology . The specific name refers to the entire telson of this species, an unusual character in the genus Sophrosyne . Diagnostic description . Head lateral cephalic lobe small, broadly rounded; eyes oval. Antenna 1 peduncular article 1 short, length 1.4 x breadth; accessory flagellum short, 0.3 x primary flagellum, article 1 long, 3 x article 2; flagellum 6-articulate, without callynophore. Antenna 2 peduncular article 3 0.6 x article 4; flagellum 5-articulate. Mandible incisors with slightly convex margins; palp article 2 slender, 1.4 x article 3, with 1 submarginal posterodistal A2-seta , without D2-setae, article 3 length 4.6 x breadth, without D3- setae, with 4 apical E3-setae. Maxilla 1 outer plate with setal-teeth in a 2/0 arrangement . Maxilla 2 inner and outer plates broad. Maxilliped inner plate subovate, without apical nodular robust setae; outer plate submarginal setae long, simple; palp article 2 slender, length 2.5 x breadth, 1.1 x article 3, article 3 slender, length 2.8 x breadth, dactylus with unguis present. Gnathopod 1 basis length 1.7 x breadth, anterior margin without setae; ischium length 1.1 x breadth; merus, posterior margin lined with long slender setae; carpus length 0.5 x propodus; propodus length 1.7 x breadth, posterior margin slightly concave, without 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 3.3 x breadth, posterior margin straight; propodus subrectangular, short, length 1.8 x breadth; palm transverse, with straight margin, with minute robust setae. Pereopod 3 merus not expanded anteriorly. Pereopod 4 merus weakly expanded anteriorly. Pereopod 5 basis moderately expanded posteriorly; merus broadly expanded posteriorly. Pereopod 6 coxa small, slightly lobate posteriorly; merus expanded posteriorly. Pereopod 7 basis posterior margin slightly rounded, minutely crenate, posteroventral margin straight, posteroventral lobe not extending beyond ischium; merus not expanded posteriorly; propodus without setae along anterior margin. Epimeron 3 posterior margin with weak spine above rounded posteroventral corner . Urosomite 1 with rounded boss, without lateral flange. Uropod 1 outer ramus slightly longer than inner ramus; outer ramus with 1 dorsal robust seta; inner ramus without dorsal robust setae. Uropod 2 rami subequal in length; rami without robust setae. Uropod 3 peduncle length 0.9 x breadth; rami inner ramus shorter than. Telson shorter than broad , length 0.9 x breadth, entire , distal margin rounded, with 2 apical slender setae. FIGURE 6. Sophrosyne hispana Chevreux , holotype, 2 mm, MOM, off Cape Finisterre, Spain. Scale for MX2 represents 0.05 mm, remainder represent 0.1 mm. FIGURE 7. Sophrosyne hispana Chevreux , holotype, 2 mm, MOM, off Cape Finisterre, Spain. Scales represent 0.2 mm. Male (sexually dimorphic characters). Antenna 1 with strong 1-field callynophore. Remarks. Sophrosyne integricauda differs from all other species of Sophrosyne in the very reduced tooth on the posterodistal corner of epimeron 3 and in the entire telson. Distribution . Bass Strait, south-eastern Australia , in 60–67 m depth.