Abstract
A new myriotrochid holothurian, Myriotrochus (Oligotrochus) meteorensis spec. nov., has been discovered in a deep-sea sample taken during an expedition with FS 'Meteor' (M 36) off north-west Africa, together with specimens of Molpadia musculus Risso, 1826, Hedingia albicans (Théel, 1886) and Protankyra cf. brychia (Verrill, 1885). The new species is similar to M. (O.) vitreus (M. Sars, 1866) and M. (O.) clarki Gage and Billett, 1986; it is thoroughly described and detailed measurements of wheel parameters are presented. This is the first record of a myriotrochid holothurian for the NE Atlantic Ocean south of 40°N.
References
Belyaev, G.M. (1970) Ultra-abyssal holothurians of the genus Myriotrochus (order Apoda, fam. Myriotrochidae). Trudy Instituta Okeanologii N.M. P.P. Shirshova, 86, 458–488. [In Russian.]
Belyaev, G.M. & Mironov, A.N. (1982) The holothurians of the family Myriotrochidae (Apoda): composition, distribution and origin. Trudy Institute Okeanologii N.M. P.P. Shirshova, 117, 81–120. [In Russian, English summary.]
Bohn, J.M. (2005) On two rare abyssal Myriotrochidae (Echinodermata: Holothuroidea: Apodida) new to the South Atlantic: Siniotrochus myriodontus Gage and Billett, 1986 and Neolepidotrochus parvidiscus angolensis subsp. nov. Organisms, Diversity and Evolution, 5, 231–238.
Gage, J.D. & Billett, D.S.M. (1986) The family Myriotrochidae Théel (Echinodermata: Holothuroidea) in the deep northeast Atlantic Ocean. Zoological Journal of the Linnean society, 88, 229–276.
Harvey, R., Gage, J.D., Billett, D.S.M., Clark, A.M. & Paterson, G.L.J. (1988) Echinoderms of the Rockall Trough and adjacent areas. 3. Additional records. Bulletin of the British Museum (Natural History), Zoology, 54, 153–198.
Heding, S.G. (1935) Holothurioidea. Part 1. Apoda.—Molpadioidea.—Gephyrothurioidea. The Danish Ingolf-Expedition, 4, 1–84.
Østergren, H. (1902) The Holothurioidea of northern Norway. Bergens Museums Aarbog, 9, 1–34.
Smirnov, A.V. (1999) Some remarks on the subgenus Oligotrochus M. Sars, 1866 sensu Heding, 1935 (genus Myriotrochus, Myriotrochidae, Holothurioidea) with description of two new species. Zoosystema, 21, 13–27.
Thiel, H. (1981) Benthic investigations in the Northwest African upwelling area. Report on the cruises 26, 36, 44 and 53 of R.V. "Meteor". Meteor Forschungsergebnisse Reihe D, 33, 1–15.