Distribution: Moderately common in the Solitary Islands Marine Park. Generally southern coast of Australia from Two Rocks Western Australia through northern Tasmania to Byron Bay in New South Wales.

Ecological Notes: Inhabits sheltered and moderately exposed reef areas. Depth to 200 m.

Additional Notes: Eye catching mosaic pattern of pale through to orange ridges encircling clusters of red, sometimes purple, papules. Feeds on sponges. Grows to diameter of 240 mm.

References: Graham J. Edgar. Australian Marine Life, 2nd Edition, 2008. Reed New Holland Publishers. p.395.

Atlas of Living Australia website at https://bie.ala.org.au/search?q=Plectaster+decanus. Accessed 12/10/2018.