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Galaxea astreata

(Lamarck, 1816)

Colonies are submassive, columnar or encrusting and commonly exceed 2 metres across in turbid water. Corallites sometimes vary greatly in size depending on where they occur on the colony; they are usually 3-4.5 millimetres diameter. Usually eight to twelve septa reach the corallite centre. Tentacles are seldom fully extended during the day.

Colour: Usually grey, also pink, green or brown.

Habitat: Reef environments protected from strong wave action.

Abundance: Common.

Similar species: Galaxea cryptoramosa , Galaxea paucisepta

Taxonomic note: Source reference: Veron (2000). Taxonomic references: Veron and Pichon (1980), Veron and Hodgson (1989). Additional identification guides: Veron (1986), Sheppard and Sheppard (1991), Nishihira and Veron (1995).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Galaxea astreata.  Scott Reef, western Australia.  A large colony composed of columns and plates.  Charlie Veron.

Galaxea astreata.Scott Reef, western Australia.A large colony composed of columns and plates.Charlie Veron.

Galaxea astreata.  Tanzania.  Colonies in the western Indian Ocean are usually columnar.  Charlie Veron.

Galaxea astreata.Tanzania.Colonies in the western Indian Ocean are usually columnar.Charlie Veron.

Galaxea astreata.  Philippines.  A large colony of tiered plated.  Charlie Veron.

Galaxea astreata.Philippines.A large colony of tiered plated.Charlie Veron.

Galaxea astreata.  Philippines.  Colonies growing in conditions of low light are usually flat plates with widely spaced corallites.  Charlie Veron.

Galaxea astreata.Philippines.Colonies growing in conditions of low light are usually flat plates with widely spaced corallites.Charlie Veron.

Galaxea astreata.  Palau.  Usual appearance in shallow water.  Gustav Paulay.

Galaxea astreata.Palau.Usual appearance in shallow water.Gustav Paulay.

Galaxea astreata.  Red Sea.  Relatively closely compacted corallites on a colony in shallow water.  Mary Stafford-Smith.

Galaxea astreata.Red Sea.Relatively closely compacted corallites on a colony in shallow water.Mary Stafford-Smith.

Galaxea astreata.  Houtman Abrolhos Islands, south-western Australia.  Widely spaced corallites on a colony in deep water.  Charlie Veron.

Galaxea astreata.Houtman Abrolhos Islands, south-western Australia.Widely spaced corallites on a colony in deep water.Charlie Veron.

Galaxea astreata.  Scott Reef, western Australia.  Corallites are sometimes very elongate.  Charlie Veron.

Galaxea astreata.Scott Reef, western Australia.Corallites are sometimes very elongate.Charlie Veron.

Galaxea astreata.  Great Barrier Reef, Australia.  Showing corallites.

Galaxea astreata.Great Barrier Reef, Australia.Showing corallites.

Galaxea astreata.  Great Barrier Reef, Australia.  Showing colony being overgrown by G. fascicularis.

Galaxea astreata.Great Barrier Reef, Australia.Showing colony being overgrown by G. fascicularis.

Galaxea astreata.  Great Barrier Reef, Australia.  Showing corallites.

Galaxea astreata.Great Barrier Reef, Australia.Showing corallites.

Galaxea astreata.  Great Barrier Reef, Australia.  Showing corallites.

Galaxea astreata.Great Barrier Reef, Australia.Showing corallites.

Galaxea astreata.  Great Barrier Reef, Australia.  Showing blistered coenosteum.

Galaxea astreata.Great Barrier Reef, Australia.Showing blistered coenosteum.

Galaxea astreata.  Great Barrier Reef, Australia.  Showing corallites.

Galaxea astreata.Great Barrier Reef, Australia.Showing corallites.