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Madracis decactis

(Lyman, 1859)

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.

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

Abundance: Sometimes common.

Similar species: Madracis mirabilis

Taxonomic note: Source reference: Veron (2000). Taxonomic references: Laborel (1969), Wells (1973b), Zlatarski and Estalella (1982). Additional identification guides: Colin (1978), Humann (1993).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Madracis decactis.  Caribbean.  Typical appearance of a small colony.  Mary Stafford-Smith.

Madracis decactis.Caribbean.Typical appearance of a small colony.Mary Stafford-Smith.

Madracis decactis.  Caribbean.  Club-shaped flattened branches.  Charlie Veron.

Madracis decactis.Caribbean.Club-shaped flattened branches.Charlie Veron.

Madracis decactis.  Brazil.  This species typically forms tall grey coloured columns in Brazil.  Charlie Veron.

Madracis decactis.Brazil.This species typically forms tall grey coloured columns in Brazil.Charlie Veron.

Madracis decactis.  Caribbean.  A branch with partly extended tentacles.  Charlie Veron.

Madracis decactis.Caribbean.A branch with partly extended tentacles.Charlie Veron.

Madracis decactis.  Caribbean.  Compact branches.  Nancy Sefton.

Madracis decactis.Caribbean.Compact branches.Nancy Sefton.

Madracis decactis.  Caribbean.  Showing corallites.

Madracis decactis.Caribbean.Showing corallites.

Madracis decactis.  Caribbean.  Showing branches.

Madracis decactis.Caribbean.Showing branches.

Madracis decactis.  Caribbean.  Showing corallites.

Madracis decactis.Caribbean.Showing corallites.

Madracis decactis.  Caribbean.  Showing corallites.

Madracis decactis.Caribbean.Showing corallites.

Madracis decactis.  Caribbean.  Showing corallites.

Madracis decactis.Caribbean.Showing corallites.