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Background  A few methanogens have been previously recovered from periodontitis lesions, yet their repertoire may not be completed. We recovered a previously unreported methanogen species in this situation.    Case presentation  A 64-year-old Caucasian woman was diagnosed with chronic, severe generalized periodontitis. In the presence of negative controls, an 18-month culture of periodontal pockets in anaerobe Hungate tube yielded “ Methanobrevibacter massiliense ” and  Pyramidobacter piscolens .    Conclusions  This case report provides evidence of the symbiotic strategy deployed by the methanogens and the anaerobes, and reports the first culture of a new methanogen, “ M. massiliense ”.    Electronic supplementary material  The online version of this article (10.1186/s13104-017-2980-3) contains supplementary material, which is available to authorized users.

A new methanogen “Methanobrevibacter massiliense” isolated in a case of severe periodontitis