bifidobacterium asteroides bifidobacterium asteroides bifidobacterium asteroides is a gram-positive, rod-shaped species of bacteria. various strains of this species have been isolated from the hindguts of honey bees. prior to 1969, this species was referred to as strains of bacillus constellatus. bifidobacterium asteroides scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: bifidobacteriales family: bifidobacteriaceae genus: bifidobacterium species: b. asteroides binomial name bifidobacterium asteroidesscardovi and trovatelli 1969 (approved lists 1980) synonyms "bacillus constellatus" white 1921