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  2. Sea urchin - Wikipedia

    en.wikipedia.org/wiki/Sea_urchin

    Sea urchins or urchins (/ ˈ ɜːr tʃ ɪ n z /) 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 fathoms). [1] Their tests (hard shells) are round and spiny, typically from 3 to 10 cm (1 ...

  3. Red sea urchin - Wikipedia

    en.wikipedia.org/wiki/Red_sea_urchin

    During larval development, urchins use bands of cilia to capture food (namely zooplankton) from the water column. [7] [8] Red sea urchins found in the channel adjacent to San Juan Island have been found to live a uniquely sedentary lifestyle with the heavy currents bringing an abundance of food. [9] [10]

  4. Diadema antillarum - Wikipedia

    en.wikipedia.org/wiki/Diadema_antillarum

    Diadema antillarum has a "shell," similar to most other sea urchins. What distinguishes the Diadema is the length of its spines. Most sea urchin spines are 1–3 cm, but the spines in this species are usually 10–12 cm in length, and can grow as long as 30 cm in very large individuals.

  5. Toxopneustes pileolus - Wikipedia

    en.wikipedia.org/wiki/Toxopneustes_pileolus

    Toxopneustes pileolus, commonly known as the flower urchin, is a widespread and commonly encountered species of sea urchin from the Indo-West Pacific.It is considered highly dangerous, as it is capable of delivering extremely painful and medically significant stings when touched.

  6. Strongylocentrotus droebachiensis - Wikipedia

    en.wikipedia.org/wiki/Strongylocentrotus...

    The water vascular system is a series of canals through which fluid moves to help propel the podia of the sea urchin. The fluid that fills the water vascular system is similar to marine water, but also has free wandering cells and organic compounds such as proteins and a high concentration of potassium ions when compared to the surrounding sea ...

  7. Echinus (sea urchin) - Wikipedia

    en.wikipedia.org/wiki/Echinus_(sea_urchin)

    Echinus is a genus of sea urchins.Sea urchins are echinoderms that are typically spherical or flattened with a covering of spine-like structures. Sea urchins tend to be important members of their ecosystems by grazing on other organisms and stabilizing populations.

  8. Water vascular system - Wikipedia

    en.wikipedia.org/wiki/Water_vascular_system

    The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. [1] The system is composed of canals connecting numerous tube feet. Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to ...

  9. Tripneustes gratilla - Wikipedia

    en.wikipedia.org/wiki/Tripneustes_gratilla

    The urchins were released to help control the invasive seaweed genus Kappaphycus, also known as "smothering seaweed," which has overrun local coral. Tripneustes gratilla stays on the reef and is an effective algae grazer. [6] The urchins were bred at Anuenue Fisheries Research Center from about a million larvae. [7]