actinomyces gerencseriae actinomyces gerencseriae actinomyces gerencseriae is a species in the genus actinomyces once known as actinomyces israelii serovar ii. actinomyces gerencseriae scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: actinomycetales family: actinomycetaceae genus: actinomyces species: a. gerencseriae binomial name actinomyces gerencseriaejohnson et al. 1990 a. gerencseriae was named for bacteriologist mary ann gerencser.