peptoniphilus lacydonensis peptoniphilus lacydonensis peptoniphilus lacydonensis is a gram-positive, anaerobic and microaerophilic bacterium from the genus of peptoniphilus which has been isolated from a patient with chronic refractory sinusitis. peptoniphilus lacydonensis scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptoniphilaceae genus: peptoniphilus species: p. lacydonensis binomial name peptoniphilus lacydonensisbeye et al. 2018 type strain csur p2013, dsm 100661, strain el1 synonyms peptoniphilus lacydonense