Normanion amblyops G. O . Sars, 1895

Kilgallen, Niamh M., Myers, Alan A. & Grath, David M, 2006, A revision of the North Atlantic amphipod genus Normanion (Crustacea: Amphipoda: Lysianassoidea), Zootaxa 1363, pp. 1-21 : 5

Normanion amblyops G. O. Sars, 1895

Figures 1–3

Normanion amblyops G. O. Sars, 1895: 674 , suppl. pl. 1, fig. 1. – Barnard and Karaman, 1991: 505. Normanion quadrimanus . – Stebbing, 1906: 42 (in part).

Type material. SYNTYPES: 5 specimens in alcohol, 4–5.5 mm, NHML 1911. 11. 8. 12768–12772.

Type locality. Rødbjerget, Trondhjemsfjord. 366–549 m (200–300 fathoms).

Material examined. Syntypes, 5 specimens in alcohol, 4–5.5 mm, from Trondhjemsfjord, NHML 1911.11.8:12768–12772; ZMO F10526, 2 specimens on slides, 5–5.5 mm.

Description. Lateral cephalic lobes subquadrate. Eyes present. Antenna 1 more or less subequal to antenna 2; flagellum 7-articulate, flagellum article 1 distinctly elongate; callynophore present; accessory flagellum 3-articulate. Antenna 2 flagellum 6-articulate; calceoli absent. Mandible palp attached proximal to molar. Maxilliped palp 4-articulate, article 4 rudimentary, palp reaching well beyond tip of inner plate.

Gnathopod 1 subchelate; coxa 1 slightly shorter than coxa 2, rounded distally; ischium elongate, more than twice as long as broad; carpus subequal in length to propodus; propodus broader than long, palm transverse, striated, and posterodistally delimited by 2 robust setae and a central spine. Gnathopod 2 minutely chelate; carpus twice as long as propodus. Pereopods 3 and 4 with short dactyls. Coxa 5 produced into a posterior lobe; pereopod 5 basis almost twice as long as broad, produced well beyond ischium; dactylus extremely long and slender. Coxa 6 produced into a posterior lobe; pereopod 6 basis almost twice as long as broad, produced beyond ischium. Pereopod 7 basis longer than broad, not produced beyond ischium.

Pleonites 1–3 with very slight dorsal depression; epimeron 1 anterodistal corner subquadrate; epimeron 3 posterodistal corner rounded. Urosomite 1 with distinct dorsal depression, distally followed by a rounded dorsal carina. Uropod 1 rami subequal; uropod 2 rami distinctly unequal, inner ramus longer than outer ramus; uropod 3 rami subequal.

Distribution. Norwegian Sea. Approximately 360– 550 m.

Remarks. N. amblyops differs from all other species of Normanion , except N. abyssi , in having a rudimentary fourth article on the maxilliped palp. It differs from descriptions N. abyssi in the presence of eyes.

Figures

FIGURE 1. Normanion amblyops Sars, 1895, female, 5 mm (syntype): (A) habitus; (B) head and antennae; (C) epimeron 3 and urosome; (D) left mandible; (E) left maxilliped. Scale bar = 0.8 mm (A); 0.4 mm (B – C); 0.1 mm (D – E).

FIGURE 2. Normanion amblyops Sars, 1895, female, 5 mm (syntype): (A) uropod 1; (B) uropod 3; (C) gnathopod 1; (D) gnathopod 2; (E) uropod 2. Scale bar = 0.2 mm.

FIGURE 3. Normanion amblyops Sars, 1895, female, 5 mm (syntype): (A) pereopod 5; (B) pereopod 6; (C) pereopod 7. Scale bar = 0.4 mm.