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DescriptionLuidia ciliaris is a large starfish, typically 40 cm across and occasionally up to 60 cm. It is red, orange-brown or yellow in colour and lighter on the underside. There are seven long arms that are a constant width along their length, tapering only at their outer end. A fringe of short white spines projects down the margins of each arm. The tube feet are long and have no suckers.Luidia ciliaris is a fragile species and may have arms that vary in width or length due to their regeneration.