Skip to Content
Sign up
Report an error

Halomitra pileus

(Linnaeus, 1758)

Colonies are large, free-living, thin and delicate, and circular, dome or bell-shaped. They have no axial furrow. Corallites are widely spaced and increase in size as the colony grows. In small colonies, septo-costae radiate in a fan from the initial point of growth or are perpendicular to the colony margin, in which case they form distinct lines of demarcation. Septa have teeth similar to those of Fungia fungites. Tentacles of mature colonies are extended only at night; those of juvenile colonies are commonly extended during the day.

Colour: Pale brown, frequently with bright pink or purple margins. Corallite centres are commonly white.

Habitat: Middle to lower reef slopes protected from wave action and lagoons on soft substrates.

Abundance: Usually uncommon.

Similar species: Zoopilus echinatus

Taxonomic note: Source reference: Veron (2000). Taxonomic references: Veron and Pichon (1980), Hoeksema (1989). Additional identification guides: Veron (1986), Nishihira and Veron (1995).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Halomitra pileus.  Tanzania.  Covering extensive areas of horizontal substrate.  Charlie Veron.

Halomitra pileus. Tanzania. Covering extensive areas of horizontal substrate. Charlie Veron.

Halomitra pileus.  Papua New Guinea.  A dome shaped colony.  Gerry Allen.

Halomitra pileus. Papua New Guinea. A dome shaped colony. Gerry Allen.

Halomitra pileus.  Tanzania.  Typical surface appearance with groups of septo-costae running in different directions.  Charlie Veron.

Halomitra pileus. Tanzania. Typical surface appearance with groups of septo-costae running in different directions. Charlie Veron.

Halomitra pileus.  Great Barrier Reef, Australia.  Corallite detail.  Neville Coleman.

Halomitra pileus. Great Barrier Reef, Australia. Corallite detail. Neville Coleman.

Halomitra pileus.  Madagascar.  Corallite detail.  Charlie Veron.

Halomitra pileus. Madagascar. Corallite detail. Charlie Veron.

Halomitra pileus.  Great Barrier Reef, Australia.  Showing septa.

Halomitra pileus. Great Barrier Reef, Australia. Showing septa.

Halomitra pileus.  Great Barrier Reef, Australia.  Showing upper surface.

Halomitra pileus. Great Barrier Reef, Australia. Showing upper surface.

Halomitra pileus.  Great Barrier Reef, Australia.  Showing lower surface.

Halomitra pileus. Great Barrier Reef, Australia. Showing lower surface.

Halomitra pileus.  Great Barrier Reef, Australia.  Showing upper surface.

Halomitra pileus. Great Barrier Reef, Australia. Showing upper surface.

Halomitra pileus.  Great Barrier Reef, Australia.  Showing upper surface.

Halomitra pileus. Great Barrier Reef, Australia. Showing upper surface.