undibacterium macrobrachii undibacterium macrobrachii undibacterium macrobrachii is a gram-negative, strictly aerobic and motile bacterium from the genus of undibacterium with a single polar flagellum which has been isolated from water from a pond which was cultivated with shrimps from pingtung in taiwan. undibacterium macrobrachii scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: oxalobacteraceae genus: undibacterium species: u. macrobrachii binomial name undibacterium macrobrachiisheu et al. 2014 type strain bcrc 80406, kctc 23916, lmg 26891, strain cmj-9