microbulbifer echini microbulbifer echini microbulbifer marinus is a gram-negative and strictly aerobic bacterium from the genus of microbulbifer which has been isolated from the gastrointestinal tract of the sea urchin heliocidaris crassispina from dokdo in korea. microbulbifer echini scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: alteromonadaceae genus: microbulbifer species: m. echini binomial name microbulbifer echinilee et al. 2017