''Hahella'' is a

Gram-negative Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall ...

, facultatively anaerobic genus of bacteria from the family of

Hahellaceae The ''Hahellaceae'' are a family of Pseudomonadota in the order of Oceanospirillales The Oceanospirillales are an order of Pseudomonadota with ten families. Description Bacteria in the ''Oceanospirillales'' are metabolically and morphologic ...

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Further reading