831 species

Galaxea astreata

(Lamarck, 1816)


Oken, 1815

Characters: 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.

Similar Species: Galaxea paucisepta, which has smaller corallites. See also G. cryptoramosa.

Habitat: Reef environments protected from strong wave action.

Abundance: Common.

Taxonomic Note: A species complex.

COTW History since Veron (2000a)
  • Family: All families are currently under review
  • Genus/species: No change