Plectaster decanus (Muller and Troschel, 1843)
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.
Inhabits sheltered and moderately exposed reef areas. Depth to 200 m.
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.
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.