Reclassification of Actinomyces propionicus

ABSTRACT Classification of the organism Actinomyces propionicus (Buchanan and Pine 1962) has been reconsidered in light of its production of propionic acid and the presence of diaminopimelic acid in its cell wall. By these characteristics it differs from all other species of the genus Actinomyces. It also differs significantly from members of the genera Bacterionema and Propionibacterium. A. propionicus is placed in the new genus Arachnia under the name of Arachnia propionica comb. nov.