persephonella guaymasensis persephonella guaymasensis persephonella guaymasensis is a thermophilic, hydrogen-oxidizing microaerophile first isolated from a deep-sea hydrothermal vent. it is strictly chemolithoautotrophic, microaerophilic, motile, 2-4 micrometres in size, rod-shaped, gram-negative and non-sporulating. its type strain is ex-h2t. persephonella guaymasensis scientific classification domain: bacteria phylum: aquificota class: aquificia order: aquificales family: hydrogenothermaceae genus: persephonella species: p. guaymasensis binomial name persephonella guaymasensisgötz et al. 2002