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Mediterranean purple sea urchin - Sphaerechinus granularis

Purple Sea Urchin Close Up Underwater Southeast Alaska

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

Sea Urchins, California. Strongylocentrotus purpuratus

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

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

Sea urchin Evechinus chloroticus on rock covered with layer of sediment and some vegetation.

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.

Stack of Green Sea Urchin Shells on Blue Background

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

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

$Blue Spotted Sea Urchin Astropyga radiata occurs in the tropical Indo-Pacific Ocean from the African coast to Australia and to Hawaii in a depth range from 0 to 60m, usually 10 to 30m, max. test diameter 20cm. \nThe species is often found in lagoons and bays where the substrate is sand, shingle or coral rubble. Sometimes many urchins collect together in one locality in dense aggregations. \n\nAstropyga radiata is mostly nocturnal and feeds by grazing on algae. The mouth is at the centre of the oral (under) surface where there are five powerful teeth.\nThis urchin is light sensitive and can angle its spines towards an approaching threatening object, but rather than centralized eyes, Astropyga radiata has a distributed sensory system. Funny thing is, a lot of people think the thing in the middle is the eyeball, but the rectum. \n\nThe sexes are separate in Astropyga radiata. Eggs and sperm are liberated into the water column. After fertilisation, the larvae are planktonic and develop through several stages before settling on the seabed. \n\nLembeh Strait, Indonesia \n1°28'56.394 N 125°15'15.588 E at 8m depth$

A Long Spined Sea Urchin (Centrostephanus longispinus) in the Mediterranean Sea

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

Sea Urchin on Rock Near Ocean Background

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

Black Long Spines Sea Urchin (Diadema Setosum) Invertebrate Marine Life

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

Sea urchin needles sharp poisonous dangerous sucker feet tentacles and mouthparts close up organism movement.

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

Sea urchin under water on white sand over Zanzibar, Tanzania coast, in the Indian Ocean

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

The stone covered harbour floor, Kolocep Island, Croatia.

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