Diaseris distorta (Cycloseris distorta) Propagation Guide
Cycloseris distorta, the classic self-fragmenting disc coral, splits itself into wedge segments by skeletal autotomy that regrow into new clones — nature's own propagation.
Overview
The coral sold as Diaseris distorta is now Cycloseris distorta, a disc coral in the family Fungiidae. It is a free-living, solitary coral native to the tropical and subtropical Indo-Pacific, found on soft sediment in shallow water. In 2011, research using molecular methods resulted in Diaseris being absorbed into the genus Cycloseris, so the names refer to the same animal.
Reproductive Mode
This species is the textbook example of asexual propagation by self-fragmentation among the Fungiidae. The disc is built of wedge-shaped segments radiating from a central mouth, and these segments are the units that detach and regrow.
Fragging / Asexual Propagation
The coral is capable of autotomy, causing itself to break apart through selective weakening of certain parts of the skeleton. The fan-shaped segments can break off and form a new polyp, a form of asexual reproduction; it may also be fragmented by physical forces such as storms. In aquaria, mature specimens commonly self-divide, so propagation is largely a matter of allowing detached wedges to settle and regenerate.
Conditions for Propagation
Mimicking its natural soft-sediment habitat with a fine sand bed and gentle flow encourages healthy self-fragmentation and lets detached wedges regrow without abrasion. Stable, clean water and feeding support the rapid tissue regeneration that drives population growth.
Sexual Reproduction
Sexual reproduction in fungiids occurs by spawning gametes into the water, but in this species asexual self-fragmentation is so prolific that large clonal aggregations can build up. For the aquarist, the asexual route is both the natural and the practical method.
Common Challenges
Tiny wedge fragments can be lost in detritus, blown into low-flow corners, or smothered if the sand bed is dirty. Keeping the substrate clean and flow gentle prevents the small clones from being buried before they regrow.