arachnia propionica arachnia propionica arachnia propionica is a gram positive, aerotolerant anaerobic species of arachnia, found as part of the normal human oral flora. arachnia propionica scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: propionibacteriales family: propionibacteriaceae genus: arachnia species: a. propionica binomial name arachnia propionica(buchanan and pine 1962) pine and georg 1969 (approved lists 1980) type strain atcc 14157ccug 4939cip 101941dsm 43307ifo 14587jcm 5830nbrc 14587nctc 12967vkm ac-1449 synonyms "actinomyces propionicus" buchanan and pine 1962 propionibacterium propionicum corrig. (buchanan and pine 1962) charfreitag et al. 1988 propionibacterium propionicus (buchanan and pine 1962) charfreitag et al. 1988 pseudopropionibacterium propionicum (buchanan and pine 1962) scholz and kilian 2016