Metopa longicornis Boeck, 1871
publication ID |
https://doi.org/ 10.11646/zootaxa.2465.1.1 |
DOI |
https://doi.org/10.5281/zenodo.10537531 |
persistent identifier |
https://treatment.plazi.org/id/931B5117-FB0A-6673-FF26-AE78FCAEBCF1 |
treatment provided by |
Felipe |
scientific name |
Metopa longicornis Boeck, 1871 |
status |
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Metopa longicornis Boeck, 1871 View in CoL
Metopa longicornis Boeck 1871: 63 View in CoL ; Boeck 1872:460–62, pl. XIX - 1
Metopa longicornis View in CoL — Hansen 1888: 97, Tab. IV, fig. 1
Metopa longicornis View in CoL — Sars 1892: 259–59, pl. 90-2
Metopa longicornis View in CoL — Stephensen 1926: 68; Stephensen 1928: 167–68, fig. 31:13–15; Stephensen 1931: 188; Stephensen 1938: 174
Metopa longicornis View in CoL — Gurjanova 1951: 426–27, fig. 268
Metopa longicornis View in CoL — Dunbar 1954: 732; Shoemaker 1955: 20; Just 1980:48, fig. 46
Material examined. Morphological examination: F2362, (det: G.O. Sars, Nansen Expedition, 78°29’N, 136°E, 24.10.1893) female, 4.5 mm.
Type locality: Christianiafjord (Oslofjord).
See figures 33, 34, 35 and 36.
Morphological redescription of female specimen identified by Sars.
Head ( Fig. 33 View FIGURE 33 ): small and rounded, cephalic lobe subacute; eyes small and round, well defined, 1/4 of head length. Antenna 1 ( Fig. 34 View FIGURE 34 ): longer than antenna 2, slender; flagellum longer than peduncle, peduncle article 2 longer than article 1, article 3 shorter than both articles 1 and 2; flagellum broken in examined material, but in photographed specimens (from same tube of samples as dissected material), the flagellum consists of 13 articles; no accessory flagellum observed. Antenna 2 ( Fig. 34 View FIGURE 34 ): also long and slender; flagellum slightly shorter than peduncle; peduncle articles 4 and 5 subequal in length; flagellum with eight articles, each with two short simple setae distally. Labrum ( Fig. 34 View FIGURE 34 ): evenly rounded. Mandible ( Fig. 34 View FIGURE 34 ): palp 3-articulate, third article tiny, second article long, first article as long as diameter, cross-section of palp circular, one seta at each of articles 2 and 3; incisor narrow and crenulate; lacinia mobilis similarly narrow but serrate; raker setae serrated and cuspidate; no molar. Maxilla 1 ( Fig. 34 View FIGURE 34 ): inner lobe elongate, one simple seta at distal margin; outer lobe broad and with straight distal margin, armed with three long and two short cuspidate and two long serrate setae, inner margin lined with simple setae; palp 1-articulate, with a tooth at apex, and a slightly serrate inner distal margin with a simple seta in each nook, minute simple setae along outer margin. Maxilla 2 ( Fig. 34 View FIGURE 34 ): outer plate in normal position to inner plate; inner plate with three long and four short setae and outer plate with seven long and seven short simple setae. Maxilliped ( Fig. 34 View FIGURE 34 ): long and narrow; inner plates fully separate, one tiny seta at distal margin of each lobe; outer plate completely reduced; palp 4-articulate, with very few setae before distal margin of article 3, which is cushioned with short simple setae, and inner margin of article 4, which is lined with simple setae.
Pereon ( Fig. 33 View FIGURE 33 ): smooth. Pereopod 1 ( Fig. 35 View FIGURE 35 ): simple; coxa subquadrate; basis straight and naked; ischium subquadrate; merus oval and boat-shaped, cushioned with short simple setae along posterior margin, with three long simple setae at distal margin; carpus elongate, length 2x width, lined with simple setae at posterior margin; propodus simple, four very thin and simple setae along posterior margin; dactylus almost as long as posterior margin propodus, with a sharp curve at tip, smooth. Pereopod 2 ( Fig. 35 View FIGURE 35 ): coxa oval, covering coxa 1, directed forwards; basis slender and straight; ischium subquadrate; merus subtriangular, one type A seta at distal margin; carpus subtriangular, with a cushion of simple short setae along posterior margin and a row of simple setae and setae type A along distal margin; propodus subrectangular, palm oblique, weakly crenulate with alternating tiny and small simple setae, palmar corner set off by two longer cuspidate setae, palm subequal in length to hind margin; dactylus as long as palm, smooth and slightly curved at tip. Pereopod 3 ( Fig. 35 View FIGURE 35 ): coxa subrectangular; basis slim and straight, rest of leg slim and simple; dactylus 0.4 length of propodus, simple and slighty curved. Pereopod 4 ( Fig. 36 View FIGURE 36 ): coxa rounded triangular; rest of leg slim and simple, with a few simple setae along both anterior and posterior margins; dactylus 0.5x propodus length, smooth and slightly curved. Pereopod 5 ( Fig. 36 View FIGURE 36 ): coxa small; basis slender and straight; rest of leg simple and narrow; dactylus short, curved. Pereopods 6 and 7 ( Fig. 36 View FIGURE 36 ): coxae small; bases posteriorly extended; meral lobe 0.15x and 0.3x of carpal length, respectively; simple setae along both anterior and posterior margins of both legs; dactyli 0.5x propodus length in both legs, very weakly curved, and smooth.
Urosome ( Fig. 33 View FIGURE 33 ): smooth. Epimeral plate 3 ( Fig. 33 View FIGURE 33 ): posterodistal corner acute. Uropod 1 ( Fig. 36 View FIGURE 36 ): longer than uropod 2; biramous; peduncle 2x length of rami, rami subequal. Uropod 2 ( Fig. 36 View FIGURE 36 ): longer than uropod 3; biramous; peduncle longer than rami; outer ramus longer than inner. Uropod 3 ( Fig. 36 View FIGURE 36 ): uniramous; peduncle shorter than ramus; ramus 2-articulate, first article longer than second. Telson ( Fig. 35 View FIGURE 35 ): elongate, length almost 3x width, tip rounded, 3 pairs of tiny cuspidate setae.
Sexual differences: no sexual differences described.
Distribution: Norwegian coast (Oslofjord (type locality) and Lofoten islands), NE Greenland, W Greenland, Ungava Bay, Davis strait, Alaska, Laptev Sea, see map Figure 66 H View FIGURE 66 .
Ecology: has been found at 30–110 m depth.
The name longicornis refers to the antennae being long.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Metopa longicornis Boeck, 1871
Tandberg, Anne Helene S. 2010 |
Metopa longicornis
Just, J. 1980: 48 |
Shoemaker, C. R. 1955: 20 |
Dunbar, M. J. 1954: 732 |
Metopa longicornis
Gurjanova, E. F. 1951: 426 |
Metopa longicornis
Stephensen, K. 1938: 174 |
Stephensen, K. 1931: 188 |
Stephensen, K. 1928: 167 |
Stephensen, K. 1926: 68 |
Metopa longicornis
Sars, G. O. & The Crustacea of Norway 1892: 259 |
Metopa longicornis
Hansen, H. J. 1888: 97 |
Metopa longicornis
Boeck, A. 1872: 460 |