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  1. Dictionary

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    sea ur·chin
    [sea urchin]
    noun
    sea urchin (noun) · sea urchins (plural noun)
    1. a marine echinoderm having a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws.
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  2. Britannica
    https://www.britannica.com/animal/sea-urchin

    Sea urchin | Description, Anatomy, & Facts | Britannica

    WEBApr 8, 2024 · sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a …

    • Ocean Conservancy
      https://oceanconservancy.org/blog/2024/04/03/all-about-echinoderms

      All About Echinoderms - Ocean Conservancy

    • Images of Echinoidea

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    • WoRMS
      https://www.marinespecies.org/echinoidea/index.php

      World Echinoidea Database - World Register of Marine …

    • TRVST
      https://www.trvst.world/biodiversity/types-of-sea-urchins

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

    • People also ask
      What is class Echinoidea?
      In summary, Class Echinoidea presents a diverse array of echinoderms, each with unique morphological and ecological adaptations. From the movable spines of sea urchins to the flattened bodies of sand dollars, this class showcases the evolutionary versatility and adaptability of echinoderms within marine ecosystems. Class 3.

      Phylum Echinodermata - Definition, Classification, Characteristics

      biologynotesonline.com
      What are examples of echinoderms?
      Common examples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and basket stars. How do echinoderms feed, and what is their feeding mechanism called? Echinoderms use a specialized feeding mechanism called Aristotle’s lantern in some species.

      Phylum Echinodermata - Definition, Classification, Characteristics

      biologynotesonline.com
      What are irregular echinoids?
      The irregular echinoids, classified further as Atelostomata and Neognathostomata, include flattened sand dollars, sea biscuits, and heart urchins. Globally, sea urchins are distributed across all oceans. From the intertidal seashore to depths reaching 16,000 feet, they continue to inhabit every depth zone.

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

      trvst.world
      What is the endoskeleton of echinoderms?
      Composition: The endoskeleton of echinoderms is composed of calcium carbonate, providing structural support. Adaptability: Depending on the species, the endoskeletal components can either be loosely connected, facilitating movement as seen in sea stars, or fused together to form a rigid structure, as observed in sea urchins.

      Phylum Echinodermata - Definition, Classification, Characteristics

      biologynotesonline.com
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    • WoRMS
      https://www.marinespecies.org/echinoidea/aphia.php?p=taxdetails&id=51…

      World Echinoidea Database - Echinidea - World Register of Marine …

    • COL | The Catalogue of Life
      https://www.catalogueoflife.org/data/dataset/1106

      COL | World Echinoidea Database

    • biologynotesonline.com
      https://biologynotesonline.com/phylum-echinodermata

      Phylum Echinodermata - Definition, Classification, Characteristics ...

    • 식량농업기구 (FAO)
      https://www.fao.org/newsroom/story/In-seas-and-stomachs-bolstering-the...

      In seas and stomachs: bolstering the long-term viability of sea …

    • WoRMS
      https://www.marinespecies.org/aphia.php/10.1017/aphia.php?p=taxdetails…

      WoRMS - World Register of Marine Species - Echinidea

    • royalsocietypublishing.org
      https://royalsocietypublishing.org/doi/10.1098/rsos.230251

      Mass mortality of the invasive alien echinoid - Royal Society

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