Halofolliculina corallasia is a species of heterotrich ciliates identified as a cause of the syndrome called skeletal eroding band (SEB).

This species is so far the only known agent causing skeletal eroding band, the most common disease of corals in the Indian and Pacific Oceans, and also found in the Red Sea.

[3][4] Members of the heterotrich family Folliculinidae are sessile, enclosing the rear ends in a lorica (Latin for cuirass, flexible body armor[5]) that is anchored to a surface, and into which the cells retract when disturbed.

It is spread by cell division of Halofolliculina corallasia, which produces a pair of worm-like larvae that settle on undamaged coral just ahead of the black band.

[1] A survey in the Caribbean Sea conducted in 2004 and published in 2006 reported a disease with very similar symptoms as SEB, affecting 25 species of coral within 6 families.

Although the authors initially suspected H.corallasia, more detailed examination showed that the culprit was another species that was previously unknown and has not yet been formally named, although it is clearly a member of the same genus, Halofolliculina.