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    Sea urchin - Wikipedia

    Reproduction Sea urchins are dioecious, having separate male and female sexes, although no distinguishing features are visible externally. In addition to their role in reproduction, the gonads are also nutrient storing organs, and are made up of two main type of cells: germ cells, and somatic cells called nutritive … 展开

    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 … 展开

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    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 Echinoidea (from the Greek ἐχῖνος ekhinos 'spine'). The … 展开

    Trophic level
    Sea urchins feed mainly on algae, so they are primarily herbivores, but can feed on sea cucumbers and a wide range of invertebrates, such as 展开

    Injuries
    Sea urchin injuries are puncture wounds inflicted by the animal's brittle, fragile spines. These are a … 展开

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    Description 图像

    Sea urchins are members of the phylum Echinodermata, which also includes starfish, sea cucumbers, sand dollars, brittle stars, and 展开

    Evolution 图像

    Musculoskeletal
    The internal organs are enclosed in a hard shell or test composed of fused plates of calcium carbonate covered by a thin dermis and 展开

    Fossil history
    The earliest echinoid fossils date to the Middle Ordovician period (circa 465 Mya). There is a rich fossil … 展开

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

    2024年10月5日 · sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores …

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

  5. Green Sea Urchin | Online Learning Center | Aquarium of the Pacific

  6. Sea Urchin - Animal Corner

  7. Red Sea Urchin | Online Learning Center - Aquarium of …

    A female sea urchin releases orange colored eggs and and the male releases white sperm through the gonopores to unite in the water column. At hatching, the planktonic larvae are bilaterally symmetrical (a single line divides the larvae …

  8. Sea Urchin: The Marine Invertebrate - Ocean Info

    Sea urchins are small, spiny, globular animals that live in the sea. They are found in all oceans, from the tropics to the poles. Sea urchins are related to sand dollars, starfish, and sea cucumbers. They are important members of the …

  9. Tripneustes ventricosus - Wikipedia

  10. Immune and Reproductive Biomarkers in Female Sea …

    2023年8月4日 · The sea urchin Paracentrotus lividus (Lamarck, 1816) is an ecologically important species, which plays key structuring and functioning roles in marine ecosystems and is constantly exposed to environmental …

  11. Urchin - Facts and Beyond - Biology Dictionary

    2020年10月24日 · The sea urchin refers to a group of about 950 species of spiny, round, marine invertebrates of the class Echinoidea. They can be found on the seafloor throughout the world’s oceans from the intertidal zone all the way …

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