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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
    Systems 图像
    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, are familiar subjects in embryology; a female may release several million …

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

  4. 15 Types of Sea Urchins: Species, Identification, and Photos - TRVST

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

  6. 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 …

  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. Exploring the World of Sea Urchins: Types, Gender, and …

    2023年9月23日 · You can distinguish between male and female sea urchins by the color of these gonads. Females exhibit a light yellow to orange hue, while males sport a reddish to dark brown color. In the market, the paler-colored …

  9. Reproduction Process of the Uniquely Attractive Sea …

    Reproduction in Sea Urchins. Sea urchins are dioecious animals. This means that the male and female sexes are separate. However, one cannot actually differentiate between the two easily. In regular sea urchins, there are five …

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