The « Frilled Star » is a turbinid endemic to northwestern Australia with a remarkable pleated lappet formed by wide spines merging together. A common grazing gastropod, it is found on reef flats among rocks in intertidal zone to very shallow water. The frilly spines are exceptionally variable in form and extent, in some specimens they are completely merged with no gaps or breaks. Usually a rather rough shell, with early whorls eroded exposing the nacre layer. Typical shell diameter around 40mm., giant specimens may exceed 65mm. At extreme low tide, Under rock slab on exposed muddy reef, Roebuck Bay, near Broome, Kimberley, Australia, 48.4mm.