831 species

Madracis decactis

(Lyman, 1859)


Milne Edwards and Haime, 1849

Characters: Colonies are nodular, laminar or encrusting. Nodules are usually flattened in section and club-shaped. Corallites are widely separated and circular to angular in outline, with a solid conical columella. Usually ten septa are present and these are fused with the columella. The coenosteum has fine spinules which sometimes form a ridge between the corallites.

Colour: Pale to dark greenish-brown or yellowish-green with pale branch tips. Bluish-grey in Brazil. Oral discs are usually not distinctive.

Similar Species: Madracis mirabilis, which has similar corallites but has branches which are finer, circular rather than flattened in section, usually has tentacles extended during the day and is yellow.

Habitat: Usually occurs in shallow water, but also found in low light conditions.

Abundance: Sometimes common.

Taxonomic References: Laborel (1969); Zlatarski and Estalella (1982); Veron (2000a);

Identification Guides: Humann (2002);

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