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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)

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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 première étude comparative des femelles de l'ordre des Mormonilloida Boxshall, 1979, à partir de matériel provenant de trois localités distinctes. De nouveaux caractères taxonomiques sont distingués; la diagnose des femelles de la famille des Mormonillidae Giesbrecht, 1893 et celle des femelles du genre Mormonilla Giesbrecht, 1891 (émendé) ainsi que du genre nouvellement établi, Neomormonilla gen. nov. sont présentées. Une nouvelle espèce, N. extremata sp. nov. est décrite à partir d'une femelle collectée sur le site d'une source hydrothermale de la Ride Est Pacifique (13° N, profondeur 2514 m), à 50 m au-dessus du fond. Les femelles de l'espèce-type N. minor (Giesbrecht, 1891) comb. nov., communes dans le plancton du Pacifique nord-oriental, sont ré-étudiées. Des femelles de N. polaris (G.O. Sars, 1900) comb. nov. collectées dans le plancton près du pôle Nord (océan Arctique, profondeurs 300-1000 m) sont également étudiées et la validité de l'espèce est rétablie.


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