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  2. Sea urchin - Wikipedia

    en.wikipedia.org/wiki/Sea_urchin

    Sea urchin. Sea urchins or urchins (/ ˈɜːrtʃɪnz /) are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms). [1] Their tests (hard shells) are round and spiny, typically from 3 to 10 ...

  3. Diadema antillarum - Wikipedia

    en.wikipedia.org/wiki/Diadema_antillarum

    Diadema antillarum. Diadema antillarum, also known as the lime urchin, black sea urchin, or the long-spined sea urchin, [2] is a species of sea urchin in the family Diadematidae. This sea urchin is characterized by its exceptionally long black spines. It is the most abundant and important herbivore on the coral reefs of the western Atlantic and ...

  4. Strongylocentrotus droebachiensis - Wikipedia

    en.wikipedia.org/wiki/Strongylocentrotus...

    Strongylocentrotus droebachiensis is commonly known as the green sea urchin because of its characteristic green color, not to be confused with Psammechinus miliaris as it is also commonly called the green sea urchin. It is commonly found in northern waters all around the world including both the Pacific and Atlantic Oceans to a northerly ...

  5. Strongylocentrotus purpuratus - Wikipedia

    en.wikipedia.org/wiki/Strongylocentrotus_purpuratus

    Strongylocentrotus purpuratus is a species of sea urchin in the family Strongylocentrotidae commonly known as the purple sea urchin. It lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico, to British Columbia, Canada. [1] This sea urchin species is deep purple in color, and lives in lower inter-tidal and nearshore ...

  6. Pseudocentrotus depressus - Wikipedia

    en.wikipedia.org/wiki/Pseudocentrotus_depressus

    Pseudocentrotus depressus, commonly known as the pink sea urchin, [2] is a species of sea urchin, one of only two species in the genus Pseudocentrotus.It was first described in 1864 by the American marine zoologist Alexander Agassiz as Toxocidaris depressus, having been collected during the North Pacific Exploring and Surveying Expedition undertaken by Captain Cadwalader Ringgold and later ...

  7. Psammechinus miliaris - Wikipedia

    en.wikipedia.org/wiki/Psammechinus_miliaris

    Psammechinus miliaris. Psammechinus miliaris is often found covered in debris (empty shells, algae, gravel...) possibly for camouflage against predatory fishes. Brittany, France. Psammechinus miliaris is a species of sea urchin in the family Parechinidae. It is sometimes known as the green sea urchin or shore sea urchin.