Juergen Freund / Blue sea star on massive Boulder coral (Gardineroseris planulata) North Sulawesi, Indonesia. This coral species is normally found from the Red Sea to Central America, and is relatively uncommon in the...

Juergen Freund / Massive boulder / Cauliflower coral (Gardineroseris planulata) with blue sea star, Buyat Bay, Sulawesi, Indonesia, Indo-pacific.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / A small Necklace sea star (Fromia monilis) on larger Blue sea star (Linckia laevigata) Sipadan, Malaysia

Juergen Freund / Horned sea stars {Protoreaster nodosus} in shallow water, Indo-Pacific

Chris Newbert / Blue Sea Star (Linckia laevigata) and schooling baitfish, 20 feet deep, Papua New Guinea

Birgitte Wilms / Brittlestar (Ophiothrix sp) juvenile on Blue Sea Star (Linckia laevigata) Solomon Islands

Fred Bavendam / Variety of small reef fish swimming in the currents above a Hard Coral reef with Sponges, Ascidians, and a blue Sea Star, Manado, North Sulawesi, Indonesia

Fred Bavendam / Basslet (Pseudanthias sp) school, swimming near a Sea Fan (Melithaea sp) and a Blue Sea Star (Linckia laevigata)

Chris Newbert / Blue Sea Star (Linckia laevigata) with two new arms budding from one leg, Indonesia

Alex Mustard / Boulder star coral (Montastrea annularis) showing fluorescent green coloration when photographed under only blue light at night to excite the fluorescent pigments in the coral, East End, Grand Cayman,...

Alex Mustard / Great star coral (Montastraea cavernosa) photographed at night under blue light to excite the fluorescence, Little Cayman, Cayman Islands. Bristish West Indies, Caribbean Sea.

Alex Mustard / Boulder star coral (Montastrea annularis) photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands. British West Indies, Caribbean Sea.

Alex Mustard / Great star coral (Montastrea cavernosa) at night, photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Great star coral (Montastrea cavernosa) at night, with polyps extended and feeding, photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribb...

Alex Mustard / Coral fluorescence photographed at night under blue light to excite the fluorescence, this image is probably a colony of knobby star coral (Solenastea hyades), Little Cayman, Cayman Islands. British W...

Alex Mustard / Boulder star coral (Montastrea annularis) photographed under blue light to excite the green fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Grey angelfish (Pomacanthus arcuatus) swimming over a colony of great star coral (Montastrea cavernosa) Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Juergen Freund / Harlequin shrimps (Hymenocera elegans) on a Linkia blue starfish, North Sulawesi, Indonesia.

Juergen Freund / Details of skin of Blue sea star (Linckia laevigata) with commensal snails hanging on to it, Bali, Indonesia.

Juergen Freund / Blue sea star (Linckia laevigata) with commensal shells attached to skin, Bali, Indonesia.

Juergen Freund / Chocolate chip starfish / Horned sea star (Protoreastor nodosus) collected in their thousands for export as decorative objects and souvenirs, coloured with dyes. Indonesia, July 2008

Juergen Freund / Brittle star (Ophiothela sp.) on blue starfish (Linckia laevigata). Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Star shaped Pincushion / Pillow cushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Star shaped Large pincushion starfish (Culcita novaeguinea), detail of the underbelly. Lembeh Strait, North Sulawesi, Indonesia.

Tim Laman / Harlequin shrimp (Hymenocera elegans) feeding on arm severed from a Blue starfish / Sea star (Linckia laevigata) , Malapascua Island, Visayan Sea, Philippines

Tim Laman / Close up of Blue starfish / Sea star (Linckia laevigata) with pink soft corals, Malapascua Island, Visayan Sea, Philippines

Doug Perrine / Sea star {Phataria unifascialis} expelling waste from its stomach, Galapagos

Tim Laman / Blue-banded Goby (Lythrypnus dalli) rests on coralline algae near a Sea star and coral and anemone polyps. Channel Islands, pacific, California, USA

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

Pete Oxford / Blue sea star (Phararia unifascialis) Floreana Island, Galapagos

Constantinos Petrinos / Sea star, starfish {Linckia laevigata} two colour variations North Sulawesi, Indonesia

Chris Newbert / Blue Sea Star (Linckia laevigata) and schooling baitfish, 20 feet deep, Papua New Guinea

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

Doug Perrine / Blue sea star {Linckia laevigata} regenerating two arms, Malapascua Island, Cebu, Philippines

Juergen Freund / Mangrove tree with Blue starfish {Linckia laevigata} split level, Papua New Guinea

Fred Bavendam / Blue Sea Star (Linckia laevigata) a common shallow reef sea star, Great Barrier Reef, Australia

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

Birgitte Wilms / Blue Sea Star (Linckia laevigata) with Blenny (Blenniidae), Solomon Islands

Roberto Rinaldi / Snorkelling woman and blue sea star, Palau, Micronesia. Model released.

Roberto Rinaldi / Blue sea star just off the beach, Rock islands, Palau, Micronesia.

Chris Newbert / Blue Sea Star (Linckia laevigata) and schooling baitfish, 20 feet deep, Papua New Guinea

Chris Newbert / Blue Sea Star (Linckia laevigata) and schooling baitfish, 20 feet deep, Papua New Guinea