thalassomonas thalassomonas thalassomonas is a genus of bacteria from the family colwelliaceae. thalassomonas bacteria can cause the coral diseases white plague. thalassomonas scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: colwelliaceae genus: thalassomonasmacián et al. 2001 type species thalassomonas viridans species t. actiniarum t. haliotis t. sediminis t. viridans