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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

    Diversity 图像
    Ecology 图像

    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

    概览 图像
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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 · The small, reddish or purplish urchins of the genus Arbacia, such as A. punctulata, the common urchin from Cape Cod to the West Indies, …

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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. 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, …

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    • Sea Urchin - Animal Corner

      Sea Urchin Reproduction. Sea urchin reproduction mostly occurs during the summer season. Sea urchins have separate male and female sexes, although no distinguishing features are visible externally. During the breeding period, the …

    • Sea urchins: Strange and spiny wonders of the ocean

      Most sea urchins reproduce by females releasing eggs directly into the water. These are then fertilised by sperm. Some species’ females hold eggs in their spines to better protect them. Most sea urchins release millions of eggs at one …

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    • Sea Urchin Anatomy - Ask A Biologist

      2015年8月22日 · Sea Urchin Anatomy. One look at a sea urchin and you can see why they would be called sea hedgehogs. They have hard rounded shells covered with sharp movable spines. Urchins are part of the phylum …

    • 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 …