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Cycloseris costulata

(Ortmann, 1889)

Polyps are circular, helmet-shaped and up to 80 millimetres diameter, with a concave undersurface. Primary septa are thick and exsert around the mouth.

Colour: Pale cream or brown, sometimes with violet margins.

Habitat: Soft inter-reef substrates and lower reef slopes protected from wave action.

Abundance: Rare.

Similar species: Cycloseris tenuis

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

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Cycloseris costulata.  Papua New Guinea.  Detail of a polyp.  Charlie Veron.

Cycloseris costulata.Papua New Guinea.Detail of a polyp.Charlie Veron.

Cycloseris costulata.  Philippines.  Showing thickened septa around the mouth.  Charlie Veron.

Cycloseris costulata.Philippines.Showing thickened septa around the mouth.Charlie Veron.

Cycloseris costulata.  Red Sea.  Detail of a polyp.  Charlie Veron.

Cycloseris costulata.Red Sea.Detail of a polyp.Charlie Veron.

Cycloseris costulata.  Great Barrier Reef, Australia.  Showing upper surface.

Cycloseris costulata.Great Barrier Reef, Australia.Showing upper surface.

Cycloseris costulata.  Ryukyu Islands, Japan.  Showing lower surface.

Cycloseris costulata.Ryukyu Islands, Japan.Showing lower surface.

Cycloseris costulata.  Philippines.  Showing upper surface.

Cycloseris costulata.Philippines.Showing upper surface.

Cycloseris costulata.  Philippines.  Showing lower surface.

Cycloseris costulata.Philippines.Showing lower surface.