pectinatus frisingensis pectinatus frisingensis pectinatus frisingensis is a species of anaerobic, gram-negative, rod-shaped bacteria first isolated from spoilt beer. pectinatus frisingensis scientific classification domain: bacteria phylum: bacillota class: negativicutes order: selenomonadales family: veillonellaceae genus: pectinatus species: p. frisingensis binomial name pectinatus frisingensisschleifer et al. 1990