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Diaseris distorta

(Michelin, 1843)

Polyps consist of fan-shaped segments up to 40 millimetres wide. Thick beaded septa are of unequal height. Polyps are commonly inflated with water to several times the volume of the skeleton.

Colour: Cream or brown, sometimes mottled.

Habitat: Soft substrates, especially where exposed to currents. Sometimes found in seagrass beds.

Abundance: Uncommon, but may be plentiful where it occurs.

Similar species:

Taxonomic note: Source reference: Veron (2000). Taxonomic reference: Veron and Pichon (1980). Additional identification guides: Veron (1986), Sheppard and Sheppard (1991), Nishihira and Veron (1995), Coles (1996).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Diaseris distorta.  Great Barrier Reef, Australia.  This species sometimes carpets soft substrates of inter-reef environments.  Ed Lovell.

Diaseris distorta.Great Barrier Reef, Australia.This species sometimes carpets soft substrates of inter-reef environments.Ed Lovell.

Diaseris distorta.  Great Barrier Reef, Australia.  With tentacles extended during the day.  Ed Lovell.

Diaseris distorta.Great Barrier Reef, Australia.With tentacles extended during the day.Ed Lovell.

Diaseris distorta.  Great Barrier Reef, Australia.  D. distorta (left) next to the much larger Cycloseris cyclolites (right).  Ed Lovell.

Diaseris distorta.Great Barrier Reef, Australia.D. distorta (left) next to the much larger Cycloseris cyclolites (right).Ed Lovell.

Diaseris distorta.  Great Barrier Reef, Australia.  In an aquarium showing the undersurface (top left) and the upper surface (bottom left) of an intact polyp, and a fragmented polyp (right).  Ed Lovell.

Diaseris distorta.Great Barrier Reef, Australia.In an aquarium showing the undersurface (top left) and the upper surface (bottom left) of an intact polyp, and a fragmented polyp (right).Ed Lovell.

Diaseris distorta.  Great Barrier Reef, Australia.  Showing upper surface.

Diaseris distorta.Great Barrier Reef, Australia.Showing upper surface.

Diaseris distorta.  Great Barrier Reef, Australia.  Showing lower surface.

Diaseris distorta.Great Barrier Reef, Australia.Showing lower surface.

Diaseris distorta.  Great Barrier Reef, Australia.  Showing upper surface.

Diaseris distorta.Great Barrier Reef, Australia.Showing upper surface.

Diaseris distorta.  Hawaii.  Showing fracture lines.

Diaseris distorta.Hawaii.Showing fracture lines.