Sophrosyne moorei, Lowry & Stoddart, 2010

Lowry, J. K. & Stoddart, H. E., 2010, Sophrosynidae, a new family in the Lysianassoidea (Crustacea: Amphipoda) with a revision of the genus Sophrosyne, Zootaxa 2370 (1), pp. 1-35 : 22-23

Sophrosyne moorei sp. nov.

Sophrosyne robertsoni . — Moore, 1983: 103, figs 1-3. — Kilgallen et al., 2007:1243 (in part).

Type material. HOLOTYPE, male, 4 mm, BMNH 1982.249:1, Camas Nathais , Lynne of Lome, Scotland (56°28.5'N 5°27'W), from stomach of whiting, Merlangius merlangus Linnaeus , 22–31 m over a soft mud bottom between rocky headlands, R. Gibson, August 1976 [material of Moore (1983)].

Type locality. Camas Nathais , Lynne of Lome, Scotland (56°28.5'N 5°27'W) .

Etymology. Named for Dr P.G. Moore, who first made known this material.

Diagnostic description. Head lateral cephalic lobe small, broadly rounded; eyes apparently absent. Antenna 1 peduncular article 1 medium length, length 1.6 x breadth; accessory flagellum medium length, 0.45 x primary flagellum, article 1 long, 2.3 x article 2; flagellum 6-articulate, with strong 1-field callynophore.

Antenna 2 peduncular article 3 0.3 x article 4; flagellum 7-articulate. Mandible incisors with straight margins; palp article 2 slender, 1 x article 3, with 4 submarginal posterodistal A2-setae, without D2-setae, article 3 length 8 x breadth, with 5 D3-setae along most of posterior margin, and 3 apical E3-setae. Maxilla 1 outer plate with setal-teeth in a 2/0 arrangement. Maxilla 2 inner and outer plates broad; inner plate length 0.6 x outer plate. Maxilliped inner plate subovate, without apical nodular robust setae; outer plate submarginal setae short, simple; palp article 2 slender, length 2.4 x breadth, 1 x article 3, article 3 slender, length 2.8 x breadth, dactylus with unguis absent. Gnathopod 1 basis length 1.8 x breadth, anterior margin with slender setae; ischium length 1.4 x breadth; merus, posterior margin with a few slender setae; carpus length 0.5 x propodus; propodus length 1.7 x breadth, posterior margin slightly concave, with simple, slender setae, palm margin straight, posterodistal corner with produced subacute spine without seta. Gnathopod 2 minutely subchelate; ischium length 2.9 x breadth; carpus long, length 3.6 x breadth, posterior margin straight; propodus subrectangular, long, length 2.3 x breadth; palm acute, with convex, smooth margin. Pereopod 3 merus weakly 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 slightly expanded posteriorly. Pereopod 7 basis posterior margin slightly rounded, minutely crenate, posteroventral margin rounded, posteroventral lobe not extending beyond ischium; merus not expanded posteriorly. Epimeron 3 posterior margin with strong upturned spine above subquadrate posteroventral corner. Urosomite 1 with rounded boss, without lateral flange. Uropod 1 rami subequal in length; outer ramus with 3 dorsal robust setae; inner ramus with 1 dorsal robust seta. 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 1.3 x breadth, moderately cleft (38%), distal margins incised, with 1 apical slender setae on each lobe.

Remarks. Although this material comes from the same area as the type material of S. inverarae and S. robertsoni , it has characters which do not allow it to sit easily with either of these species. It differs from S. robertsoni in having an angular posteroventral corner on epimeron 3 and only a few setae on the anterior margin of gnathopod 1 basis It differs from S. inverarae in having a broadly rounded head lobe and the telson cleft about 40%. It differs from both of these species in not having a proximal shoulder on the posterior margin of pereopod 5 basis.

Sophrosyne moorei shares with S. ruffoi the absence of a robust seta on the corner of the gnathopod 1 palm, an angular posteroventral corner on epimeron 3 and a moderately cleft telson. They differ in the convex palm of gnathopod 2 (concave in S. ruffoi ) and the more strongly lobate coxa 6 in S. ruffoi .

Distribution. Lynn of Lorne, Scotland.