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Acropora horrida

(Dana, 1846)

Colonies are usually open branched, becoming bushy on upper reef slopes and in shallow lagoons. Main branches of colonies in turbid water have irregular branchlets; those in shallow clear water have compact branchlets, giving colonies a bushy appearance. Corallites are irregular and the surface of branches is rough. Tentacles are usually extended during the day.

Colour: Usually pale blue (which may photograph pink or purple), sometimes dark blue or pale yellow or brown. Polyps are pale blue or white.

Habitat: Turbid water around fringing reefs.

Abundance: Usually uncommon.

Similar species:

Taxonomic note: Taxonomic note: This species is divisible into several smaller semi-distinct taxonomic units. 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 horrida.  Great Barrier Reef, Australia.  null.  Charlie Veron.

Acropora horrida. Great Barrier Reef, Australia. null. Charlie Veron.

Acropora horrida.  Great Barrier Reef, Australia.  Typically twisted appearance of branches.  Charlie Veron.

Acropora horrida. Great Barrier Reef, Australia. Typically twisted appearance of branches. Charlie Veron.

Acropora horrida.  Great Barrier Reef, Australia.  Bottlebrush branches in shallow water.  Ed Lovell.

Acropora horrida. Great Barrier Reef, Australia. Bottlebrush branches in shallow water. Ed Lovell.

Acropora horrida.  Papua New Guinea.  Branch detail.  Charlie Veron.

Acropora horrida. Papua New Guinea. Branch detail. Charlie Veron.

Acropora horrida.  Great Barrier Reef, Australia.  Bushy branches.  Ed Lovell.

Acropora horrida. Great Barrier Reef, Australia. Bushy branches. Ed Lovell.

Acropora horrida.  Coral Sea.  Branch tips.  Charlie Veron.

Acropora horrida. Coral Sea. Branch tips. Charlie Veron.

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

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

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

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

Acropora horrida.  Great Barrier Reef, Australia.  Showing radial corallites.

Acropora horrida. Great Barrier Reef, Australia. Showing radial corallites.

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

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

Acropora horrida.  Southern Red Sea.  Showing branching pattern.

Acropora horrida. Southern Red Sea. Showing branching pattern.

Acropora horrida.  Southern Red Sea.  Showing radial corallites.

Acropora horrida. Southern Red Sea. Showing radial corallites.

Acropora horrida.  Southern Red Sea.  Showing branch tips.

Acropora horrida. Southern Red Sea. Showing branch tips.