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Acropora humilis

(Dana, 1846)

Colonies are digitate. Branches are thick, 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 and have thick walls and only slightly increase in size 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.

Habitat: Exposed upper reef slopes and reef flats.

Abundance: Usually common, and sometimes a dominant species.

Similar species:

Taxonomic note: Source reference: Veron (2000). Taxonomic references: Veron and Wallace (1984), Wallace (1999). Additional identification guides: Veron (1986), Nishihira and Veron (1995).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Acropora humilis.  Great Barrier Reef, Australia.  Intertidal reef dominated by A. humilis and allied species.  Terry Done.

Acropora humilis. Great Barrier Reef, Australia. Intertidal reef dominated by A. humilis and allied species. Terry Done.

Acropora humilis.  Great Barrier Reef, Australia.  Very common on intertidal outer reef flats.  Ed Lovell.

Acropora humilis. Great Barrier Reef, Australia. Very common on intertidal outer reef flats. Ed Lovell.

Acropora humilis.  Great Barrier Reef, Australia.  Large axial corallites.  Ed Lovell.

Acropora humilis. Great Barrier Reef, Australia. Large axial corallites. Ed Lovell.

Acropora humilis.  Great Barrier Reef, Australia.  Radial corallites aligned in rows down branches.  Charlie Veron.

Acropora humilis. Great Barrier Reef, Australia. Radial corallites aligned in rows down branches. Charlie Veron.

Acropora humilis.  Papua New Guinea.  Branch tips.  Neville Coleman.

Acropora humilis. Papua New Guinea. Branch tips. Neville Coleman.

Acropora humilis.  Great Barrier Reef, Australia.  Showing branch tip.

Acropora humilis. Great Barrier Reef, Australia. Showing branch tip.

Acropora humilis.  Great Barrier Reef, Australia.  Showing branch tips.

Acropora humilis. Great Barrier Reef, Australia. Showing branch tips.

Acropora humilis.  Great Barrier Reef, Australia.  Showing skeletal detail.

Acropora humilis. Great Barrier Reef, Australia. Showing skeletal detail.

Acropora humilis.  Great Barrier Reef, Australia.  Showing branching pattern.

Acropora humilis. Great Barrier Reef, Australia. Showing branching pattern.

Acropora humilis.  Great Barrier Reef, Australia.  Showing branching pattern.

Acropora humilis. Great Barrier Reef, Australia. Showing branching pattern.

Acropora humilis.  Great Barrier Reef, Australia.  Showing characteristic branching pattern.

Acropora humilis. Great Barrier Reef, Australia. Showing characteristic branching pattern.

Acropora humilis.  Great Barrier Reef, Australia.  Showing branch end.

Acropora humilis. Great Barrier Reef, Australia. Showing branch end.

Acropora humilis.  Great Barrier Reef, Australia.  Showing axial corallite.

Acropora humilis. Great Barrier Reef, Australia. Showing axial corallite.