A new calanoid copepod (Spinocalanidae) swarming at a cold seep site on the Gabon continental margin (Southeast Atlantic)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Adult females, subadult males at 5(th) copepodid stage and adult males of Methanocalanus gabonicus, a new genus and species of the family Spinocalanidae Vervoort, 1951 (Copepoda, Calanoida), were found in hydrocarbon fluids, a few centimetres above vesicomyid and mytilid bivalves aggregating at the giant pockmark Regab on the Gabon continental margin (Southeast Atlantic) at a depth of 3151-3155 m. After description of the monotypic genus Isaacsicalanus Fleminger, 1983 from the East Pacific Rise, this is the second finding of calanoid copepods swarming in deep sea chemosynthetic environment. Methanocalanus gen. nov., a sister genus to the genus Isaacsicalanus, is characterized by the following derived characters: 3 large teeth on the masticatory blade of mandible separated from 5 others by a groove; I seta on the second to fourth articulating endopodal segment of maxilliped. The female exhibits, as many calanoid genera, a ventral semi-circular genital operculum covering the paired gonopores. Morphological and anatomical observations of M. gabonicus gen. nov., sp. nov. indicate that females of this species can feed on small particles from or near the bottom environment while the males are supposed to not feed.