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close-up sea urchin on rock with blue sea in background. Paracentrotus lividus

Echinoidea sea urchins, a group of marine animals belonging to the type of echinoderms Echinodermata, characterized by a spherical shape, .Zanzibar near the town of Jambiani

Sea Urchins, California. Strongylocentrotus purpuratus

The stone covered harbour floor, Kolocep Island, Croatia.

Mediterranean purple sea urchin - Sphaerechinus granularis

This image shows several sea urchins, with one opened to reveal its bright yellow insides. The sea urchin's shell is covered with black spines, creating a sharp contrast. The background consists of light-colored ice, highlighting the details of the sea urchin.

Purple and black sea urchins underwater, Mediterranean sea, Vermilion coast, Roussillon, France

Sea Urchin Echinoderm Underwater Sea life, Macro abstract background. sea urchin spines and teeth

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

Foot on a sea urchin. Human feet on sea urchin at the beach. Male foot steeping on sea urchin in ocean water

Paracentrotus lividus is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean

Black sea-urchin standing on the yellow wood.

Under the crystal clear water of the Aegean Sea there are a huge number of sea urchins on the rocks in Greece

Small puddle filled with water after high tide with some marine life: mussels, sea urchins, fry, etc.

Sea urchins in the Adriatic Sea dangerous wild animals in Croatia

Man preparing raw sea urchins, also called garoines.

Black sea urchin (Arbacia lixula) underwater on the beach

Purple Sea Urchin Close Up Underwater Southeast Alaska

Close-up view of purple sea urchin nestled in rocky tidal pool. Natural lighting highlights textures and muted earth tones in surrounding environment. Detailed focus reveals marine life intricacies

$Cala Fosca in Costa Brava\n\nParacentrotus lividus$

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

black spiny Sea urchin on a rock by the sea with a boat in the water and mountains on the background

Rock boring urchin, Echinometra mathaei, nestled in a crevise of a tide pool. The urchin uses it jaws to enlarge the hole as it grows. Ko Olina, Oahu, Hawaii.

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