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Pachyseris speciosa

(Dana, 1846)

Colonies are unifacial laminae, usually horizontal, but may develop upright ridges or columns. They commonly form stands several metres across. More than one row of corallites may occur between ridges. Columellae are absent.

Colour: Pale brown to deep grey, often with pale margins.

Habitat: All reef habitats but most common on lower reef slopes.

Abundance: Common.

Similar species: Pachyseris gemmae

Taxonomic note: Source reference: Veron (2000). Taxonomic reference: Veron and Pichon (1980). Additional identification guides: Randall and Myers (1983), Veron (1986), Sheppard and Sheppard (1991), Nishihira and Veron (1995).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Pachyseris speciosa.  Tanzania.  Large colonies of tiered laminae.  Charlie Veron.

Pachyseris speciosa. Tanzania. Large colonies of tiered laminae. Charlie Veron.

Pachyseris speciosa.  Ryukyu Islands, Japan.  Large colonies comprised of laminae with fluted margins are unusual.  Charlie Veron.

Pachyseris speciosa. Ryukyu Islands, Japan. Large colonies comprised of laminae with fluted margins are unusual. Charlie Veron.

Pachyseris speciosa.  Philippines.  Surface of tiered fronds.  Charlie Veron.

Pachyseris speciosa. Philippines. Surface of tiered fronds. Charlie Veron.

Pachyseris speciosa.  Great Barrier Reef, Australia.  Detail of a flat plate.  Neville Coleman.

Pachyseris speciosa. Great Barrier Reef, Australia. Detail of a flat plate. Neville Coleman.

Pachyseris speciosa.  Great Barrier Reef, Australia.  Detail of valleys showing the absence of a columella wall.  Charlie Veron.

Pachyseris speciosa. Great Barrier Reef, Australia. Detail of valleys showing the absence of a columella wall. Charlie Veron.

Pachyseris speciosa.  Red Sea.  Large colonies of tiered laminae.  Mary Stafford-Smith.

Pachyseris speciosa. Red Sea. Large colonies of tiered laminae. Mary Stafford-Smith.

Pachyseris speciosa.  Great Barrier Reef, Australia.  Showing valleys.

Pachyseris speciosa. Great Barrier Reef, Australia. Showing valleys.

Pachyseris speciosa.  Great Barrier Reef, Australia.  Showing plate surface.

Pachyseris speciosa. Great Barrier Reef, Australia. Showing plate surface.

Pachyseris speciosa.  Great Barrier Reef, Australia.  Showing valleys.

Pachyseris speciosa. Great Barrier Reef, Australia. Showing valleys.