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Ctenactis crassa

(Dana, 1846)

Polyps are elongate, with an axial furrow extending almost to the polyp ends. Several mouths are arranged along the axial furrow but do not occur outside the furrow.

Colour: Pale brown.

Habitat: Reef slopes protected from strong wave action and on sandy floored reef lagoons.

Abundance: Usually uncommon.

Similar species: Ctenactis echinata

Taxonomic note: Source reference: Veron (2000). Taxonomic reference: Hoeksema (1989). Additional identification guide: Nishihira and Veron (1995).

Map displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Ctenactis crassa.  Papua New Guinea.  Showing the axial furrow reaching the ends of the polyp.  Neville Coleman.

Ctenactis crassa.Papua New Guinea.Showing the axial furrow reaching the ends of the polyp.Neville Coleman.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing septa.

Ctenactis crassa.Great Barrier Reef, Australia.Showing septa.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing upper surface.

Ctenactis crassa.Great Barrier Reef, Australia.Showing upper surface.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing upper surface.

Ctenactis crassa.Great Barrier Reef, Australia.Showing upper surface.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing central mouth.

Ctenactis crassa.Great Barrier Reef, Australia.Showing central mouth.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing axial furrow.

Ctenactis crassa.Great Barrier Reef, Australia.Showing axial furrow.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing lower surface.

Ctenactis crassa.Great Barrier Reef, Australia.Showing lower surface.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing secondary mouths.

Ctenactis crassa.Great Barrier Reef, Australia.Showing secondary mouths.

Ctenactis crassa.  Great Barrier Reef, Australia.  Showing septa.

Ctenactis crassa.Great Barrier Reef, Australia.Showing septa.