ancylobacter polymorphus ancylobacter polymorphus ancylobacter polymorphus is a bacterium from the family of xanthobacteraceae. ancylobacter polymorphus scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: xanthobacteraceae genus: ancylobacter species: a. polymorphus binomial name ancylobacter polymorphusxin et al. 2006 type strain as 1.2800, ccug 30553, cgmcc 1.2800, cip 109301, dsm 2457, ici pla5, ncib 10516, ncimb 10516, pla5