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Male Leach's sea star (Leiaster leachi) broadcast spawning, releasing streams of sperm from its arms. Kagoshima Prefecture, Kyushu, Japan
Mouth of Common Sea Urchin (Echinus esculentus) Guillaumesse, Sark, British Channel Islands
Necklace seastar (Fromia monilis) on Sea cucumber (Bohadaschia argus) Yap, Micronesia
Pearlfish (Carapus acus) in anus of Sea cucumber (Stichopus regalis). These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain
Starfish Beach, with many starfish in the shallow sea (Asteroidea) Colon Island, Bocas del Toro Archipelago, Bocas del Toro Province, Panama
Purple sea star (Pisaster ochraceus) in shallow water beneath forest. Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean
California sea lion (Zalophus californianus) uses a Panamic cushion star (Pentaceraster cumingi) as a toy. The sealions pick up the starfish and then drop them and chase after them as they sink
Cushion star (Culcita novaeguineae), detail, Triton Bay, West Papua, Indonesia, Pacific Ocean
Crinoid or feather star (Antedon mediterranea) on Violescent sea whip or Red sea fan (Paramuricea clavata) Punta Campanella Marine Protected Area, Amalfi Coast, Italy, Tyrrhenian Sea, Mediterranean
Slate pencil sea urchins (Heterocentrotus mammillatus) on coral reef with Pyramid butterflyfish (Hemitaurichthys polylepis), Hawaii
Purple and Ochre sea stars (Pisaster ochraceus) preying on Pacific blue mussels (Mytilus trossulus). Also seen are Green Surf Anemones (Anthopleura xanthogrammica)
Red starfish (Echinaster sepositus) group on sea floor, Tenerife, Canary Islands
Blue starfish (Coscinasterias tenuispina) close up of arm with tube feet, Tenerife, Canary Islands
Atlantic feather star (Antedon bifida) Tenerife, Canary Islands
Panamic Cushion Sea Star (Pentaceraster cumingi) and a school of Yellow-tailed Grunt (Anisotremus interruptus), Galapagos Island, Ecuador. December
Slate pencil sea urchins (Heterocentrotus mammillatus) in Hawaiian reef scene with Black triggerfish (Melichthys niger) Hawaii
Purple sea urchin (Sphaerechinus granularis), three of different colours. Tenerife, Canary Islands
Kaleidoscopic image of crinoids or feather stars. Indonesia
Horse mussel (Modiolus modiolus) bed with Brittlestars (Ophiothrix fragilis) and Edible crab (Cancer pagurus), Shetland, Scotland, UK, September
Sea cucumber / Sea apple (Pseudocolochirus violaceus) Rinca, Komodo National Park, Indonesia
Sea apple (Pseudocolochirus violaceus) Komodo National Park, Indonesia
Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia
Kaleidoscopic image of Feather stars (Crinoidea) and Gorgonian wrapper anemone.(Nemanthus annamensis). Indonesia. Western Pacific
Sea apple, eating, using arm to transfer food into mouth. Ninepin Group or Kwo Chau Islands, Sai Kung District of Hong Kong, China
High magnification photo of the spines of a Common starfish (Asterias rubens). Gulen, Bergen, Norway. North Sea, North East Atlantic Ocean
Sea cucumber (Bohadschia argus) which has ejected a part of its internal organs called Cuvierian tubules. These significantly sticky strings are a defense mechanism designed to deter predators
Pearlfish (Carapus acus) outside of host Sea cucumber (Stichopus regalis) at night. These species have a commensal relationship, with the fish living in the gut of the sea cucumber. Catalonia, Spain
Plumose anemones (Metridium senile) and common starfish (Asterias rubens) beneath the sun in a Norwegian Fjord. Gulen, Bergen, Norway. North East Atlantic Ocean
Coleman shrimp (Periclimenes colemani) close up, on a fire urchin (Asthenosoma varium). Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean
Starfish close up detail, Blairgowrie, Mornington Penisular, Victoria, Australia. Port Philip Bay, Bass Strait
Blue sea star (Linckia laevigata) on coral reef, Fiji, South Pacific
RF - Long-spined sea urchin (Astropyga radiata). Lembeh Strait, North Sulawesi, Indonesia
Deep red Feather star shrimp (Hippolyte prideauxiana) crawling secretly amongst the arms of a Feather star (Antedon bifida), Loch Duich, Highands, Scotland, UK
Pair of Coleman shrimps (Periclimenes colemani) living in a fire urchin (Asthenosoma varium). The female is the larger shrimp
Panamic cushion sea star (Pentaceraster cumingi) detail. Huatulco Bays National Park, Oaxaca state, Mexico, Pacific Ocean. November
Sea star (Odontaster validus) on Ribbon kelp (Durvillaea antarctica), Antarctic Peninsula, Antarctica, Southern Ocean
Horned sea star / Chocolate chip sea star (Protoreaster nodosus) on the rocky seabed, Isabela Island, Galapagos Islands, Pacific Ocean
Raccoon butterflyfish (Chaetodon lunula), endemic Saddle wrasse (Thalassoma duperrey) and Sea urchin (Diadema sp)Raccoon butterflyfish (Chaetodon lunula), endemic Saddle wrasse (Thalassoma duperrey) and Sea urchin (Diadema sp.) on reef, Lanai, Hawaii, Pacific Ocean
Close up of the tube feet of a Purple velvet seastar (Leiaster leachi), extending from the protective crevice in one of its arms, Maui, Hawaii, Pacific Ocean
Suensons brittle star (Ophiothrix suensonii) on Azure vase sponge (Callyspongia plicifera), St. Vincent, Caribbean
Honeycomb / Cushion starfish (Pentaceraster alveolatus) composite image on black background showing colour variations Malapascua Island, Philippines, Indo-Pacific species
Sea star (Asterias rubens) on kelp, Vevang, Norway, Atlantic Ocean
Close up look between the spines of a Slate pencil sea urchin (Heterocentrotus mammillatus), Hawaii, Pacific Ocean
Ten-lined urchin (Eucidaris metularia) nestled on a reef, close up, Hawaii, Pacific Ocean
Slate pencil sea urchin (Heterocentrotus mammillatus) on a reef with Black triggerfish (Melichthys niger) and a Bluestripe snapper (Lutjanus kasmira) swimming above, Maui, Hawaii, Pacific Ocean
Close up of three arms from a Feather star (Crinoidea), Triton Bay, West Papua, Indonesia, Pacific Ocean
Common starfish (Asterias rubens) with pink encrusting algae, Farne Islands, Northumberland, UK, North Sea
Aggregation of Common sea urchins (Echinus esculentus) beneath Cuvie kelp (Laminaria hyperborea) forest, Farne Islands, Northumberland, UK, North Sea