NDLI: A new calanoid copepod (Spinocalanidae) swarming at a cold seep site on the Gabon continental margin (Southeast Atlantic)

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A new calanoid copepod (Spinocalanidae) swarming at a cold seep site on the Gabon continental margin (Southeast Atlantic)

Content Provider	Semantic Scholar
Author	Ivanenko, Viatcheslav N. Defaye, Danielle Cuoc, Corinne
Copyright Year	2007
Abstract	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 envi- ronment. 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; 1 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. Resume : Un nouveau copepode calanoide profond (Spinocalanidae) vivant en essaim sur une source de fluides froids de la marge continentale du Gabon (Atlantique sud-est). Des femelles, des mâles et des copepodites V mâles de Methanocalanus gabonicus, une nouvelle espece d'un nouveau genre de la famille des Spinocalanidae Vervoort, 1951 (Copepoda, Calanoida), ont ete trouves dans des fluides charges en hydrocarbures, a quelques centimetres au-dessus d'agregats de bivalves Vesicomyidae et Mytilidae dans le "pockmark" geant Regab sur la pente continentale du Gabon (Atlantique sud-est) a une profondeur de 3151-3155 m. Apres la description du genre monospecifique Isaacsicalanus Fleminger, 1983 de la Ride Est Pacifique, c'est la deuxieme decouverte de copepodes calanoides formant des essaims en environnement profond chimiosynthetique. Methanocalanus gen. nov., groupe frere du genre Isaacsicalanus, est caracterise par les caracteres derives suivants : trois fortes dents sur la lame mastricatrice de la mandibule separees des cinq autres par une depression, une seule soie sur le second et jusqu'au quatrieme segment de l'endopodite du maxillipede. Les femelles, comme chez de nombreux calanoides, presentent ventralement un opercule genital semi-circulaire recouvrant les gono- pores. Les caracteres morphologiques et anatomiques suggerent que les femelles se nourrissent de particules en suspension pres ou sur le fond, alors que les mâles ne s'alimentent pas.
Starting Page	37
Ending Page	54
Page Count	18
File Format	PDF HTM / HTML
Volume Number	48
Alternate Webpage(s)	http://www.cmarz.org/pdf/taxon_refs/Ivanenko-etal_Methanocalanus_2007.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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