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  1. Wikipedia
    https://en.wikipedia.org/wiki/Sea_urchin

    Sea urchin - Wikipedia

    • Sea urchins or urchins 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). Their tests (hard shells) are round and spiny, typically from 3 to 10 cm (1 to 4 in) across. Sea urchins move slowly, crawling with their tu… 展开

    Diversity

    Sea urchins are members of the phylum Echinodermata, which also includes starfish, sea cucumbers, sand dollars, brittle stars, and crinoids. Like other echinoderms, they have five-fold symmetry (called pentamerism) … 展开

    Description

    Urchins typically range in size from 3 to 10 cm (1 to 4 in), but the largest species can reach up to 36 cm (14 in). They have a rigid, usually spherical body bearing moveable spines, which give the class the name Echinoide… 展开

    Sea Urchin - Description, Habitat, Image, Diet, and Interesting Facts
    Habitat of the Sea Urchin. Despite their frequency in the intertidal zone, in tide pools, sea urchins can be found at many different depths and in any habitats. They can also be found in nearly any ocean …
    Animals Network · https://animals.net/sea-urchin
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    Diversity
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  1. Every ocean
    Sea urchins are found in every ocean and in every climate, from the tropics to the polar regions, and inhabit marine benthic (sea bed) habitats, from rocky shores to hadal zone depths.

    Sea urchin - Wikipedia

    en.wikipedia.org/wiki/Sea_urchin
    en.wikipedia.org/wiki/Sea_urchin
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    How many types of sea urchins are there?
    There are hundreds of species of sea urchins. ©NatalieJean/Shutterstock.com Some of the more interesting types of the 950 species include: Strongylocentrotus purpuratus, the Pacific purple sea urchin, is a key ingredient in uni sushi. The inky black Diademasea urchin helps keep Caribbean coral reefs healthy by keeping plant growth down.

    Sea Urchin - A-Z Animals

    a-z-animals.com
    Where do sea urchins live?
    Sea urchins are found in every ocean and in every climate, from the tropics to the polar regions, and inhabit marine benthic (sea bed) habitats, from rocky shores to hadal zone depths. The fossil record of the Echinoids dates from the Ordovician period, some 450 million years ago.

    Sea urchin - Wikipedia

    en.wikipedia.org
    Are sea urchins animals?
    Sea urchins are animals. ©JGA/Shutterstock.com Sea urchins are small sea animals that have spherical shells called tests that are typically covered in spines similar to those of a porcupine. Very small tube-shaped feet among the spines help them move slowly along the ocean floor.

    Sea Urchin - A-Z Animals

    a-z-animals.com
    What is a sea urchin called?
    Sea urchins are also called sea hedgehogs, sand dollars, and sea biscuits. Sea urchins are animals that are typically small, spiny, and round. They live in all the earth’s oceans, at depths ranging from the tide line to 15,000 feet. Because they cannot swim, they live on the sea floor.

    Sea Urchin - A-Z Animals

    a-z-animals.com
    Where do flower urchins live?
    The flower urchin are widespread and common in the tropical Indo-West Pacific. They reside among coral reefs, coral rubble, rocks, sand, and seagrass beds at depths of 0 to 90 m (0 to 295 ft). These sea urchins are relatively large sea urchins and can reach a maximum diameter of around 15 to 20 cm (6 to 8 in).

    Sea Urchin - Animal Corner

    animalcorner.org
    Are sea urchins globular or spiny?
    Sea urchins are globular, spiny sea creatures that make up the class Echinoidea. There are around 950 species of sea urchin, and they inhabit the seabed of every ocean and every depth zone, from the tide line to 15,000 feet deep.

    Sea Urchin - Animal Corner

    animalcorner.org
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  3. Animals Network
    https://animals.net/sea-urchin

    Sea Urchin - Description, Habitat, Image, Diet, and Interesting Facts

  4. Britannica
    https://www.britannica.com/animal/se…

    Sea urchin | Description, Anatomy, & Facts | Britannica

    2024年10月5日 · Sea urchins live on the ocean floor, usually on hard surfaces, and use the tube feet or spines to move about. In addition, a few carnivorous species have been described. The largest urchin (known from a single …

  5. AZ Animals
    https://a-z-animals.com/animals/sea-urchin

    Sea Urchin - A-Z Animals

  6. Ocean Conservancy
    https://oceanconservancy.org/blog/2020/07/29/sea-urchins

    Stop Sea-Urching, Here’s Everything You Need to Know About Sea …

  7. where do sea urchin live 的视频

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  8. Ocean Info
    https://oceaninfo.com/animals/sea-urchin

    Sea Urchin: The Marine Invertebrate - Ocean Info

    Where do sea urchins live? Sea urchins are found in the world’s oceans, including the Arctic, Atlantic, Indian, and Pacific Oceans. They are distributed across various latitudes and can be found in temperate and tropical waters.

  9. Animal Corner
    https://animalcorner.org/animals/sea-ur…

    Sea Urchin - Animal Corner

    Sea Urchin Location and Habitat. Sea urchins live in oceans throughout the world and can found on the bottom of the sea bed, from the tide line to 15,000 feet deep. They reside where there is a lot of food, amongst coral, substrate …

  10. Natural History Museum
    https://www.nhm.ac.uk/discover/sea-urc…

    Sea urchins: Strange and spiny wonders of the ocean

    Sea urchins can be found in all of Earth’s oceans. Some species live between the high and low tide lines near the seashore. Others live in the deep ocean, mostly up to 5,000 metres below the surface. The deepest a sea urchin has ever …

  11. WorldAtlas
    https://www.worldatlas.com/articles/se…

    Sea Urchin Facts: Animals of the Oceans - WorldAtlas

    2018年3月22日 · Some species of sea urchins live in shallow or a deep rocky seabed. Sea urchins typically inhabit deep waters only if there is wave action although some species are resistant to the action. The creatures are also …

  12. National Park Service
    https://www.nps.gov/places/sea-urchin.htm

    Sea Urchin - U.S. National Park Service