pediococcus claussenii pediococcus claussenii pediococcus claussenii is a species of gram-positive bacteria. like other pediococcus species, p. claussenii is implicated in the spoilage of fermented beverages due to its production of diacetyl. strains of this species were originally isolated from spoiled beer. pediococcus claussenii scientific classification domain: bacteria phylum: bacillota class: bacilli order: lactobacillales family: lactobacillaceae genus: pediococcus species: p. claussenii binomial name pediococcus clausseniidobson et al. 2002 the genome of p. claussenii strain atcc baa-344 has been sequenced.