Juergen Freund / Blue starfish {Linckia laevigata} close up of arm with parasitic snails {Thyca crystallina} attached, Indo-Pacific

Doug Perrine / Parasitic sea snail {Thyca crystallina} camouflaged on arm of blue sea star {Linckia laevigata} Mabul Island, Sabah, Borneo, Malaysia

Fred Bavendam / Limpet (Thyca crystallina) living on coral surface and the Blue Sea Star (Linckia laevigata), Manado, North Sulawesi, Indonesia