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Planktonic Deep-water Copepods of the Family Mormonillidae Giesbrecht, 1893 from the East Pacific Rise (13°N), the Northeastern Atlantic, and Near the North Pole (Copepoda, Mormonilloida)

2006; Brill; Volume: 79; Issue: 6 Linguagem: Francês

10.1163/156854006778026861

1568-5403

Viatcheslav N. Ivanenko, Defaye,

Subterranean biodiversity and taxonomy

This paper is the first comparative study of females of the order Mormonilloida Boxshall, 1979 from three distinct localities. New taxonomic characters of mormonillids are distinguished; the diagnoses of females of the family Mormonillidae Giesbrecht, 1893, and the diagnoses of females of the genus Mormonilla Giesbrecht, 1891 (emended) as well as the newly established genus Neomormonilla gen. nov. are presented. A new species, N. extremata sp. nov. is described, based on a female collected from a hydrothermal vent community of the East Pacific Rise (13°N, depth 2514 m, 50 m over bottom). Females of the type species, N. minor (Giesbrecht, 1891) comb. nov., common in plankton of the northeastern Atlantic, are studied anew. Females of N. polaris (G.O. Sars, 1900) comb. nov., from plankton near the North Pole (Arctic Ocean, depths 300-1000 m) are re-examined and the validity of the species is re-established. Ce travail est la premiere etude comparative des femelles de l'ordre des Mormonilloida Boxshall, 1979, a partir de materiel provenant de trois localites distinctes. De nouveaux caracteres taxonomiques sont distingues; la diagnose des femelles de la famille des Mormonillidae Giesbrecht, 1893 et celle des femelles du genre Mormonilla Giesbrecht, 1891 (emende) ainsi que du genre nouvellement etabli, Neomormonilla gen. nov. sont presentees. Une nouvelle espece, N. extremata sp. nov. est decrite a partir d'une femelle collectee sur le site d'une source hydrothermale de la Ride Est Pacifique (13° N, profondeur 2514 m), a 50 m au-dessus du fond. Les femelles de l'espece-type N. minor (Giesbrecht, 1891) comb. nov., communes dans le plancton du Pacifique nord-oriental, sont re-etudiees. Des femelles de N. polaris (G.O. Sars, 1900) comb. nov. collectees dans le plancton pres du pole Nord (ocean Arctique, profondeurs 300-1000 m) sont egalement etudiees et la validite de l'espece est retablie.