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Madracis asanoi

Yabe and Sugiyama, 1941

This is a primarily azooxanthellate species forming extensive thickets. Colonies consist of clumps of fine twisted branches. Corallites are subcerioid, closely compacted and circular, with solid conical columellae. Usually ten septa are present. These are exsert and fused with the columella deep within the corallite. The coenosteum is covered by fine spinules. Tentacles are usually extended only at night.

Colour: Mottled brown or green.

Habitat: Deep water, usually below 50 metres depth.

Abundance: Common, but seldom seen by divers.

Similar species: Madracis asperula

Taxonomic note: Source reference: Veron (2000). Taxonomic reference: Yabe and Sugiyama’s original description/specimens. Additional identification guide: Nishihira and Veron (1995).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Madracis asanoi.  Palau.  This colony from 100 metres depth has zooxanthellae giving it a brown colour.  Pat Colin.

Madracis asanoi.Palau.This colony from 100 metres depth has zooxanthellae giving it a brown colour.Pat Colin.

Madracis asanoi.  Palau.  This species mostly occurs in deep water where it is azooxanthellate. This colony was found under an overhang at 120 metres depth.  Pat Colin.

Madracis asanoi.Palau.This species mostly occurs in deep water where it is azooxanthellate. This colony was found under an overhang at 120 metres depth.Pat Colin.

Madracis asanoi.  Mainland Japan.  Showing corallites.

Madracis asanoi.Mainland Japan.Showing corallites.