Skip to Content
Sign up
Report an error

Galaxea horrescens

(Dana, 1846)

Colonies are arborescent. Corallites are tubular and thin walled with flaring rims. Columellae are absent. Septa are very exsert. Tentacles are usually extended only at night. They have tapering translucent tentacles with white tips.

Colour: Pale brown, yellow or green, sometimes with white branch ends.

Habitat: Usually found in reef areas with good water circulation and light availability.

Abundance: Uncommon.

Similar species: Galaxea acrhelia

Taxonomic note: Source reference: Veron (2000). Taxonomic reference: Veron and Pichon (1980, as Acrhelia horrescens). Additional identification guides: Randall and Myers (1983), Veron (1986), Nishihira and Veron (1995), all as Acrhelia horrescens.

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Galaxea horrescens.  Great Barrier Reef, Australia.  Colonies are usually compact in shallow water exposed to wave action.  Ed Lovell.

Galaxea horrescens.Great Barrier Reef, Australia.Colonies are usually compact in shallow water exposed to wave action.Ed Lovell.

Galaxea horrescens.  Papua New Guinea.  A finely branched colony.  Jim Maragos.

Galaxea horrescens.Papua New Guinea.A finely branched colony.Jim Maragos.

Galaxea horrescens.  Indonesia.  With tentacles extended during the day.  Charlie Veron.

Galaxea horrescens.Indonesia.With tentacles extended during the day.Charlie Veron.

Galaxea horrescens.  Guam.  Corallites usually have very long sabre-like septa.  Gustav Paulay.

Galaxea horrescens.Guam.Corallites usually have very long sabre-like septa.Gustav Paulay.

Galaxea horrescens.  Great Barrier Reef, Australia.  Showing branch tip.

Galaxea horrescens.Great Barrier Reef, Australia.Showing branch tip.

Galaxea horrescens.  Great Barrier Reef, Australia.  Showing corallites.

Galaxea horrescens.Great Barrier Reef, Australia.Showing corallites.

Galaxea horrescens.  Great Barrier Reef, Australia.  Showing corallites.

Galaxea horrescens.Great Barrier Reef, Australia.Showing corallites.

Galaxea horrescens.  Great Barrier Reef, Australia.  Showing branching pattern.

Galaxea horrescens.Great Barrier Reef, Australia.Showing branching pattern.

Galaxea horrescens.  Great Barrier Reef, Australia.  Showing branching pattern.

Galaxea horrescens.Great Barrier Reef, Australia.Showing branching pattern.