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Siderastrea radians

(Pallas, 1766)

Colonies are massive, usually less than 300 millimetres across. They sometimes occur as free-living mobile balls. Corallites are rounded, deep, usually irregular and 2.5-3 millimetres diameter. Septa are in three clearly defined cycles. Columellae consist of one or a few granules.

Colour: Uniform light browns.

Habitat: Shallow reef.

Abundance: Common.

Similar species:

Taxonomic note: Source reference: Veron (2000). Taxonomic references: Roos (1971), Cairns (1982), Zlatarski and Estalella (1982). Additional identification guides: Colin (1978), Humann (1993).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Siderastrea radians.  Caribbean.  Adjacent colonies of S.radians (right) and S. siderea (left)..  Paul Humann.

Siderastrea radians.Caribbean.Adjacent colonies of S.radians (right) and S. siderea (left)..Paul Humann.

Siderastrea radians.  Caribbean.  Typical appearance of a small colony.  Paul Humann.

Siderastrea radians.Caribbean.Typical appearance of a small colony.Paul Humann.

Siderastrea radians. Skeletal detail.  Geoff Kelly.

Siderastrea radians.Skeletal detail.Geoff Kelly.

Siderastrea radians.  Caribbean.  Showing colony surface.

Siderastrea radians.Caribbean.Showing colony surface.

Siderastrea radians.  Caribbean.  Showing corallites.

Siderastrea radians.Caribbean.Showing corallites.

Siderastrea radians.  Caribbean.  Showing corallites.

Siderastrea radians.Caribbean.Showing corallites.