actinomycetaceae actinomycetaceae the actinomycetaceae (often called actinomycetes or mycelial bacteria) are a family of bacteria in the order actinomycetales that contains the medically important genus actinomyces. these organisms are closely related to the mycobacteria, but were originally classified as fungi because they were thought to be transitional forms between bacteria and fungi. actinomycetaceae scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: actinomycetales family: actinomycetaceaebuchanan 1918 (approved lists 1980) type genus actinomycesharz 1877 (approved lists 1980) genera see text. synonyms arcanobacteriaceae salam et al. 2020 genera the family actinomycetaceae comprises the following genera: actinobaculum lawson et al. 1997 "actinomonospora" castellani et al. 1959 actinomyces harz 1877 (approved lists 1980) actinotignum yassin et al. 2015 "ancrocorticia" xu et al. 2019 arcanobacterium collins et al. 1983 boudabousia nouioui et al. 2018 bowdeniella corrig. nouioui et al. 2018 buchananella nouioui et al. 2018 flaviflexus du et al. 2013 fudania zhu et al. 2019 gleimia nouioui et al. 2018 mobiluncus spiegel and roberts 1984 "neoactinobaculum" belkacemi et al. 2019 pauljensenia nouioui et al. 2018 peptidiphaga beall et al. 2021 schaalia nouioui et al. 2018 "scrofimicrobium" wylensek et al. 2020 trueperella yassin et al. 2011 varibaculum hall et al. 2003 winkia nouioui et al. 2018 phylogeny the currently accepted taxonomy is based on the list of prokaryotic names with standing in nomenclature (lpsn). the phylogeny is based on whole-genome analysis. actinomycetales actinobaculum actinotignum trueperella arcanobacterium buchananella bowdeniella actinomyces winkia varibaculum mobiluncus pauljensenia boudabousia gleimia schaalia outgroup bifidobacteriales notes flaviflexus, fudania, and peptidiphaga are not included in this phylogenetic tree.