Sophrosyne inverarae, 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 : 17-19

Sophrosyne inverarae sp. nov.

( Figs10–12 )

Sophrosyne robertsoni . — Norman, 1900: 196 (in part). — Moore, 1984: 37 (in part, part = S. moorei ). — Lincoln, 1979: 52, fig. 17. — Kilgallen et al., 2007: 1243, fig. 1.

Type material. HOLOTYPE, female, ovigerous (at least 5 eggs), 6.5 mm, BMNH 1911:11:8:12449-12551, Inveraray , Loch Fyne, Scotland (approx. 56°13'N 5°4'W), 1874 . PARATYPE, female, same locality [material recorded by Norman (1900) as S. robertsoni ].

Type locality. Inveraray , Loch Fyne, Scotland (approx. 56°13'N 5°4'W) .

Etymology. The specific name is a reference to the type locality.

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 medium length, 0.5 x primary flagellum, article 1 short, 1.2 x article 2; flagellum 7-articulate, without callynophore. Antenna 2 peduncular article 3 0.5 x article 4; flagellum 7-articulate. Mandible incisors with slightly convex margins; palp article 2 slender, 1 x article 3, with 1 submarginal posterodistal A2-seta, D2-setae present, article 3 length 5.6 x breadth, with 1 distal D3-seta and 3 apical E3-setae. Maxilla 1 outer plate with setal-teeth in a 2/5

arrangement. Maxilla 2 inner plate narrow, outer plate broader; inner plate length 0.6 x outer plate. Maxilliped inner plate subrectangular, without apical nodular robust setae; outer plate submarginal setae short, simple; palp article 2 slender, length 2.2 x breadth, 1.1 x article 3, article 3 slender, length 2.4 x breadth, dactylus with unguis absent. Gnathopod 1 basis length 1.5 x breadth, anterior margin with slender 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 bearing vestigial seta. Gnathopod 2 minutely subchelate; ischium length 3.1 x breadth; carpus long, length 3.3 x breadth, posterior margin straight; propodus subrectangular, long, length 2.1 x breadth; palm transverse, with straight margin, with minute robust setae. 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 not expanded posteriorly; propodus without setae along anterior margin. Epimeron 3 posterior margin with strong upturned spine above subquadrate posteroventral corner. Urosomite 1 with anterodorsal notch and 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; outer ramus with robust setae. Uropod 3 peduncle length 1.4 x breadth; rami subequal in length. Telson longer than broad, length 1.1 x breadth, moderately cleft (48%), distal margins incised, with 1 apical slender setae on each lobe.

Remarks. Sophrosyne inverarae shares with S. murrayi and S. rodondo the same setal-tooth arrangement on the outer plate of maxilla 1, a vestigial seta on the posterodistal corner of the gnathopod 2 propodus, the shape of the basis of pereopods 5 and 6, a curved posteroventral corner with strong upturned tooth on epimeron 3 and a moderately cleft telson. Sophrosyne inverarae differs from both species in having D2- and D3-setae on the mandibular palp. It differs from S. murrayi most noticeably in having a minutely subchelate second gnathopod.

Distribution. Loch Fyne, Inveraray, Scotland.

Figures

FIGURE 10. Sophrosyne inverarae sp. nov., holotype female, 6.5 mm, BMNH 1911:11:8:12449-12551, Inverary, Scotland.

FIGURE 11. Sophrosyne inverarae sp. nov., holotype female, 6.5 mm, BMNH 1911:11:8:12449-12551, Inverary, Scotland. Scales represent 0.2 mm.

FIGURE 12. Sophrosyne inverarae sp. nov., holotype female, 6.5 mm, BMNH 1911:11:8:12449-12551, Inverary, Scotland. Scales represent 0.1 mm.