Sophrosyne ledoyeri, 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

Sophrosyne ledoyeri sp. nov.

Sophrosyne hispana . — Ledoyer, 1977: 389, fig. 23.

Type material. Holotype, male, 4 mm, MVRCr, south of Île des Embiez , north-west Mediterranean Sea (approx. 43°10'N 5°50'E), 100–120 m, night time, 26 June 1975 (stn FVP 39) (not examined, material of Ledoyer (1977) as S. hispana ).

Type locality. South of Île des Embiez, Mediterranean Sea, 100–120 m.

Etymology. This species is named for Michel Ledoyer, who first made this material known.

Diagnostic description. Head lateral cephalic lobe small, narrowly rounded; eyes apparently absent. Antenna 1 peduncular article 1 short, length 1.4 x breadth; accessory flagellum medium length, 0.5 x primary flagellum, article 1 long, 2.4 x article 2; flagellum 6-articulate, with strong 1-field callynophore. Antenna 2 peduncular article 3 0.36 x article 4; flagellum 6-articulate. Mandible incisors with straight margins; palp article 2 broadened distally, 1 x article 3, with 4 submarginal posterodistal A2-setae, without D2-setae, article 3 length 5.8 x breadth, with 6 D3-setae along most of posterior margin, and 2 apical E3-setae. Maxilla 1 outer plate with setal-teeth in a 2/0 arrangement. Maxilla 2 inner plate narrow, outer plate broader; inner plate length 0.64 x outer plate. Maxilliped [inner plate unknown]; outer plate submarginal setae long, simple; palp article 2 slender, length 2.3 x breadth, 1 x article 3, article 3 slender, length 2.4 x breadth, dactylus with unguis absent. Gnathopod 1 basis length 2 x breadth, anterior margin without setae; ischium length 1.2 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, with robust setae, palm margin sinusoidal, posterodistal corner with produced subacute spine without seta. Pereopod 3 merus weakly expanded anteriorly. Pereopod 4 merus weakly expanded anteriorly. Pereopod 5 basis moderately expanded posteriorly; merus moderately expanded posteriorly. Pereopod 6 coxa small, strongly 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 slightly expanded posteriorly; propodus without setae along anterior margin. Epimeron 3 posterior margin with strong upturned spine above subquadrate posteroventral corner. Urosomite 1 with rounded boss, with lateral flange. Uropod 1 outer ramus slightly longer than inner ramus; outer ramus with 2 dorsal robust setae; inner ramus without dorsal robust setae. Uropod 2 rami subequal in length; outer ramus with robust setae. Uropod 3 peduncle length 1.7 x breadth; rami inner ramus shorter than. Telson as long as broad, length 2 x breadth, deeply cleft (68%), distal margins rounded, with 1 apical slender setae on each lobe.

Remarks. Sophrosyne ledoyeri shares with S. abyssi an angled posteroventral corner with strong upturned tooth on epimeron 3 and a deeply cleft telson. In S. ledoyeri the small seta on the corner of the palm of gnathopod 1 is apparently absent. The shape of the dorsal margin of urosomite 1 is distinctly different between these species.

Distribution. North-western Mediterranean Sea in 100–120 m depth.