roseofilum reptotaenium roseofilum reptotaenium roseofilum reptotaenium, also called coral killer, is a unicellular species of cyanobacteria. it is the pathogenic agent responsible for black band disease on siderastrea siderea coral. roseofilum reptotaenium scientific classification domain: bacteria phylum: cyanobacteria class: cyanophyceae order: oscillatoriales family: coleofasciculaceae genus: roseofilum species: r. reptotaenium binomial name roseofilum reptotaeniumd. casamatta, d. stanic, m. gantar, & l.l. richardson, 2012