Metopa clypeata Kroyer 1842

• Main Authors: Tandberg, Anne Helene S., Vader, Wim
• Format: Other/Unknown Material
• Language: unknown
• Published: 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Stenothoidae; Metopa; Metopa clypeata; Bering Sea; Greenland; Seta
• Online Access: https://zenodo.org/record/6216424; https://doi.org/10.5281/zenodo.6216424

Metopa clypeata (Krøyer, 1842) Fig. 1–9, 19– 21. Leucothoe clypeata Krøyer, 1842: 157; Krøyer 1845: 545, pl. 6 fig. 2 a–f Leucothoe norvegica Liljeborg, 1850 Montagua clypeata Bate, 1862: 58; Goës, 1866: 522 Metopa clypeata Boeck, 1870: 60, Boeck, 1872: 451, pl. XVIII- 4, XIX- 3, Hansen, 1888: 90, fig III- 3, Shoemaker, 1955: 15, fig. 5 a–f, Just, 1980: 46 ? Metopa beringiensis Oldevig, 1959: 45 –46, pl. 1 fig. 7–8 non Metopa clypeata Gurjanova, 1951: 417 Material examined. Morphological examination: ZMUC-CRU 6050 (Greenland), male, 6.4 mm; ZMUC- CRU 6050, female, 8.9 mm TYPE material; USNMNH 419533, male, 7 mm (Albatross station 3282, Bering Sea); Zool. Mus. AN No 22646 (114-1950); SEM-examination: ZMUC-CRU 6050, male, 6 mm. Morphological redescription of male type material. Head (Fig. 1): epistome small and rounded, cephalic lobe not prominent, with acute tip; eye 1 / 3 of head length, well defined. Antenna 1 (Fig. 1): long and slender, half length of body; flagellum of approximately 20 articles, one small seta on each article; no accessory flagellum observed. Antenna 2 (Fig. 1): shorter than A 1; peduncle longer than flagellum; flagellum of 10 articles, each with one thin seta. Labrum (Fig. 2): rounded. Mandible (Fig. 2): mandibular palp 2 - articulate (see Discussion), circular in cross-section, 5 serrated setae with an inner smooth core (type A setae, see Discussion) on article 1, very small apical article (article 2) with 1–2 type A setae at apex; incisor and lacinia mobilis both serrate and well developed; raker setae with 3 plumose setae nearest incisor and 7–8 serrate raker setae further back; no molar. Maxilla 1 (Fig. 2): inner plate with one simple distal seta; outer plate with 3 cuspidate and 3 serrated distal setae and 7 simple setae on inner margin; palp 1 -articulate, 2 x length of outer plate, with 3 cuspidate distal setae, 4 simple setae on inner margin and several simple facial setae. Maxilla 2 (Fig. 1): outer plate in normal position to and slightly longer than inner plate; both plates with ...