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Underwater scene of a sea urchin on the reef

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

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

Spiny black sea urchin (Diadema setosum) grazing on algae in tropical coral reefs. Vital for reef ecosystem balance.

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

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

Edible sea urchin Echinus esculentus underwater in Norway cold clear waters

Fromia Elegans Starfish in Home Coral reef aquarium

$Tubifer Cardinalfish Siphamia tubifer (ex. Siphamia versicolor) occurs in the tropical Indo-West Pacific from the Red Sea south to Madagascar and east through the Maldives, Sri Lanka and India to the Andaman Sea Islands and to Western Australia, north to the Ryukyus andthroughout the Indo-Malayan region to Vanuatu in a depth range from 1 to 100m, usually to 18m depth, max. length 7cm. \nThe species forms small groups with long-spined urchins, but is also found among the spines of Acanthaster planci. Siphamia tubifer feeds on zooplankton and small invertebrates. The specimen encountered in this Blue Spotted Sea Urchin Astropyga radiata is dark brown. Depending on the phase the species can be striped instead.\nBlue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \nLembeh Strait, North Sulawesi, Indonesia \n1°28'47.814 N 125°15'1.26 E at 23m depth$

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

Single purple sea urchin in the middle of coral reef tank in an aquarium

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

Pisaster brevispinus Sphaerechinus Tripneustes ventricosus get along in the same aquarium. Symbiosis.

Underwater photo of starfish and sea urchin.

Peltaster placenta, Mediterranean sea native star

Starfish, sea urchins, and spiral sea snails in shallow water or tank, blurred or wavy visual effect.

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

A textured stack of dried starfish arranged on a dark surface. The composition highlights their natural shapes and marine-inspired aesthetic, evoking coastal charm and organic design.

Starfish in blue water as nature underwater sea life background

Sea Urchin Echinoderm shell texture. Underwater Sea life, Macro abstract background.

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