831 species

Acropora horrida

(Dana, 1846)


Oken, 1815

Characters: 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.

Similar Species: Acropora tortuosa. See also A. vaughani, which has widely spaced corallites and a smooth coenosteum.

Habitat: Turbid water around fringing reefs.

Abundance: Usually uncommon.

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