831 species

Acropora humilis

(Dana, 1846)


Oken, 1815

Characters: Colonies are digitate. Branches are thick, gradually tapering to large dome-shaped axial corallites. Small branchlets or incipient axial corallites usually occur at the base of main branches. Radial corallites are of two sizes, the larger are usually in rows, have thick walls and only increase slightly down the sides of branches.

Colour: Many colours, but most usually cream, brown, purple or blue (which may photograph purple) with blue or cream tips.

Similar Species: Acropora gemmifera, which has small axial corallites and radial corallites increasing in length down branches. See also A. monticulosa and A. torresiana.

Habitat: Exposed upper reef slopes and reef flats.

Abundance: Usually common, and sometimes a dominant species.

Taxonomic Note: A species complex.

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