colwellia echini colwellia echini colwellia echini is a gram-negative, rod-shaped, and facultatively anaerobic bacterium from the genus colwellia which has been isolated from the sea urchin strongylocentrotus droebachiensis from øresund in denmark. colwellia echini scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: colwelliaceae genus: colwellia species: c. echini binomial name colwellia echinichristiansen et al. 2018 type strain lmg 30125 synonyms colwellia agarilytica