caulobacteraceae caulobacteraceae caulobacteraceae is a family of pseudomonadota within the alpha subgroup. like all pseudomonadota, the caulobacteraceae are gram-negative. caulobacteraceae includes the genera asticcacaulis, brevundimonas, phenylobacterium and caulobacter. caulobacteraceae caulobacter crescentus scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: caulobacterales family: caulobacteraceaehenrici and johnson 1935 (approved lists 1980) genera aquidulcibacter cai et al. 2018 asticcacaulis poindexter 1964 (approved lists 1980) brevundimonas segers et al. 1994 caulobacter henrici and johnson 1935 (approved lists 1980) phenylobacterium lingens et al. 1985 terricaulis vieira et al. 2020 the typespecies caulobacter gives its name also to the recently proposed subclass, the caulobacteridae, which includes the orders caulobacterales, parvularculales, hyphomicrobiales, rhodobacterales, rhodospirillales, sneathiellales, sphingomonadales, kiloniellales, kordiimonadales and controversially the holosporales.