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  1. Sea urchin | Description, Anatomy, & Facts | Britannica

    WEB8 apr. 2024 · Learn about sea urchins, spiny marine invertebrates with a globular body and a radial arrangement of organs. Find out how they …

  2. Sea urchins: Strange and spiny wonders of the ocean

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  4. Sea Urchins - National Geographic

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

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    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.
    en.wikipedia.org
    Adult sea urchins are usually well protected against most predators by their strong and sharp spines, which can be venomous in some species.
    en.wikipedia.org
    The name urchin is an old word for hedgehog, which sea urchins resemble; they have archaically been called sea hedgehogs. The name is derived from the Old French herichun, from Latin ericius ('hedgehog').
    en.wikipedia.org
    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 tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea otters, starfish, wolf eels, and triggerfish.
    en.wikipedia.org
  7. Sea Urchin - Description, Habitat, Image, Diet, and …

    WEBLearn about the sea urchin, a spiky ball-shaped animal that lives in various oceans and feeds on algae and other organisms. Discover its adaptations, reproduction, and how it relates to humans as food, injury, and research.

  8. 15 Types of Sea Urchins: Species, Identification, and Photos - TRVST

  9. Sea Urchin: The Marine Invertebrate - Ocean Info

  10. Sea Urchin Animal Facts | Echinoidea - A-Z Animals

    WEB4 dagen geleden · Learn about sea urchins, small, spiny animals that live on the ocean floor and have no eyes. Find out their history, classification, diet, predators, and more.

  11. Sea Urchin Anatomy | Ask A Biologist

    WEB22 aug. 2015 · Learn about the unique organs and features of sea urchins, such as their water system, Aristotle's lantern, and spines. See illustrations and labels of sea urchin parts and how they work together.

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