Metacyphocaris helgae Tattersall 1906
Creators: name: Lowry, J. K.
name: Stoddart, H. E.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Cebocaridae
Metacyphocaris
Metacyphocaris helgae

description: <i>Metacyphocaris helgae</i> Tattersall, 1906 (Figs 3, 4) <i>Metacyphocaris Helgae</i> Tattersall, 1906: 29, pl. 3 fig. 1, pl. 4. — Stephensen, 1912a: 88. — Stephensen, 1912b: 613. — Stephensen, 1913: 113. — Stephensen, 1915: 38. — Stephensen, 1923: 54. — Schellenberg, 1926b: 216, figs 26c, 27. — Schellenberg, 1927: 666, fig. 60. — Pirlot, 1929: 8. — Schellenberg, 1929: 196. — K.H. Barnard, 1932: 37, fig. 5. — Stephensen, 1932: 354. — Stephensen, 1933: 9. — Chevreux, 1935: 28. — Thorsteinson, 1941: 60, pl. 3 figs 31-38. — Shoemaker, 1945: 189. — J.L. Barnard, 1958: 95. — Birstein &amp; Vinogradov, 1958: 222. — Birstein &amp; Vinogradov, 1960: 171. — Gurjanova, 1962: 79, fig. 14. — Hurley, 1963: 22, fig. 3. — Birstein &amp; Vinogradov, 1964: 156. — O'Riordan, 1969: 32. — Thurston &amp; Allen, 1969: 361. — Vader, 1983: 140 (table 1). — Umezu, 1984: 128. — Austin, 1985: 601. — Costello <i>et al.</i>, 1989: 32. — Barnard &amp; Karaman, 1991: 502. — Palerud &amp; Vader, 1991: 38. — Lopes <i>et al.</i>, 1993: 209. — Thurston, 2001: 684 (table 2). <b>Type localities</b> (for syntypes). 40 miles north by west of Eagle Island, County Mayo, Ireland, eastern North Atlantic Ocean, [approx. 54°30'N 11°30'W], 1152 m over 1189+ m; same locality, 1371 m over 1829+ m; west of Porcupine Bank, eastern North Atlantic Ocean, 53°07'N 15°06'W, 1371 m over 1573 m; 50 miles north by west of Eagle Island, County Mayo, Ireland, eastern North Atlantic Ocean, [approx. 54°30'N 11°30'W], 1097 m over 2195 m; same locality, 2113 m over 2195 m. <b>Material examined.</b> 1 specimen, immature, 11.5 mm, MV J15797, south of Point Hicks, Victoria, Australia, 38°27.20'S 149°09.70'E, 8 m rectangular midwater trawl, 22 July 1986, M.F. Gomon <i>et al.</i>, RV <i>Franklin</i>, stn SLOPE 24. <b>Distribution.</b> Atlantic, Indian and Pacific Oceans, between 65°N and 40°S; to 4740 m depth (see remarks). <b>Remarks.</b> Tattersall (1906: 30), in his original description of <i>Metacyphocaris helgae</i>, said it had no mandibular palp, only a "very small rounded tubercular appendage". We have examined a specimen from the syntype series and confirm this description. Tattersall used this character to separate <i>Metacyphocaris</i> from <i>Paracyphocaris</i>. K.H. Barnard (1932) reported material of <i>M. helgae</i> from the South Atlantic Ocean with a rudimentary 2-articulate mandibular palp. Shoemaker (1945) also reported material with a rudimentary 2-articulate mandibular palp from Bermuda in the western North Atlantic Ocean and Hurley (1963) reported material with a 1- articulate palp from the San Nicholas Basin, eastern Pacific Ocean. There are now 18 literature reports of <i>M. helgae</i> material, recording more than 100 specimens. Most are not illustrated or described so it is not possible to assess the variation in the mandibular palp or any other characters which might indicate separate species. The single specimen we record here has no mandibular palp and matches very well with Tattersall's type material. The depth range cited above is very unlikely. According to Thurston (2010 <i>in</i> litt.) this is ‘the bottom depth under the 0–4990 m haul listed in Birstein &amp; Vinogradov (1960). Virtually all Birstein &amp; Vinogradov hauls were made with open nets and the depths quoted are metres of wire out. The same is true for most mid-water hauls, even those made in horizontal mode. I have unpublished data for <i>M. helgae</i> collected in the North Atlantic at 60N20W, 53N20W, 40N20W and 30N23W to depths of 2000 m or more. Based on an analysis of more than 200 specimens obtained using the opening/closing IOS RMT1+8 nets, the species occurs in all layers from 600–700 m down to 1250–1500 m. Single specimens were caught at 500–600 m and 1500–2000 m.’
description: Published as part of <i>Lowry, J. K. &amp; Stoddart, H. E., 2011, The new deep-sea families Cebocaridae fam. nov., Cyclocaridae fam. nov. and Thoriellidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea), pp. 53-68 in Zootaxa 2747 (1)</i> on pages 56-57, DOI: 10.11646/zootaxa.2747.1.4, http://zenodo.org/record/5291255
description: {"references": ["Tattersall, W. M. (1906) The marine fauna of the coast of Ireland. Part VIII. Pelagic Amphipoda of the Irish Atlantic slope. Department of Agriculture and Technical Instruction for Ireland, Fisheries Branch, Scientific Investigations, 1905 (4), 3 - 39, pls 1 - 5.", "Stephensen, K. (1912 a) Report on the Malacostraca collected by the \" Tjalfe \" - Expedition under the direction of cand. mag. Ad. S. Jensen, especially at W. Greenland. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, 64, 57 - 134.", "Stephensen, K. (1912 b) Report on the Malacostraca Pycnogonida and some Entomostraca collected by the Danmark Expedition to north-east Greenland. Meddelelser om Gronland, 45, 501 - 630, pls 39 - 43.", "Stephensen, K. (1913) Gronlands Krebsdyr og Pycnogonider (Conspectus Crustaceorum et Pycnogonidorum Groenlandiae). Meddelelser om Gronland, 22, 1 - 479.", "Stephensen, K. (1915) Isopoda, Tanaidacea, Cumacea, Amphipoda (excl. Hyperiidea). 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