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Sea anemone and starfish in a pacific northwest tide pool

Kauderns Cardinalfish Longfin swim by black long spined sea Urchin Diadema in Japan aquarium. Sealife journey in danger.

The Red Urchin, blue-spotted urchin; Fire Urchin or False Fire Urchin, Astropyga radiata, is an urchin, with a test (shell) diameter of about 20 cm. It is found in the Indo-Pacific region. Maui Island, Hawaii

Red starfish on an underwater rock covered in corals and seaweed. Photo taken at Cattolica aquarium

Peltaster placenta, Mediterranean sea native star

A sea urchin with long needles. Diadema Setosum. They are distributed everywhere in coral reefs of tropical waters. Starfish in the background.

Single starfish on the beach. Diani Beach, Mombasa, Kenya.

Copenhagen, Denmark - October 11, 2018 : View of a starfish

Red pencil urchin, Heterocentrotus mamillatus, in a brilliant red color typical of specimens near Hawaii.

Fromia Elegans Starfish in Home Coral reef aquarium

Tropical fish between sea anemones in an aquarium from Salzburg city in Austria

Red knob sea star, its scientific name is Protoreaster linckii

An Saltwater Fish Tank with Coral and Fish

Background of Kina Shells with differential focus. The focus is on the top Kina Shell. This photo is in soft focus.

Black Long-spined Sea Urchin. Diadema setosum.

Beautiful underwater scene with sea urchin in aquarium in Dusseldorf, Germany. Tropical scenery.

Three starfish with purple and yellow patterns on a black tray. Water droplets on the surface make the starfish appear more vibrant

sand sifting starfish (archaster typicus) moving through the glass of a reef aquarium

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is that many people think the thing in the middle is the eyeball, but it is the rectum. \nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \nLembeh Strait, Indonesia \n1°27'13.104 N 125°14'14.634 E at 12m depth$

Starfish in blue water as nature underwater sea life background

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