gramella marina gramella marina gramella marina is a gram-negative, aerobic and heterotrophic bacterium from the genus of gramella which has been isolated from the sea urchin strongylocentrotus intermedius. gramella marina scientific classification domain: bacteria phylum: bacteroidota class: flavobacteriia order: flavobacteriales family: flavobacteriaceae genus: gramella species: g. marina binomial name gramella marinanedashkovskaya et al. 2010 type strain kmm 6048