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  2. Sea urchin - Wikipedia

    en.wikipedia.org/wiki/Sea_urchin

    Sea urchins move by walking, using their many flexible tube feet in a way similar to that of starfish; regular sea urchins do not have any favourite walking direction. [13] The tube feet protrude through pairs of pores in the test, and are operated by a water vascular system ; this works through hydraulic pressure , allowing the sea urchin to ...

  3. 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.

  4. Echinothuriidae - Wikipedia

    en.wikipedia.org/wiki/Echinothuriidae

    These sea urchins have a disc-like body, more or less bulging, structured by a flexible test, which is nearly unique among sea urchins. Most species can grow quite big and live in deep seas, though some genera contain shallow species (especially Asthenosoma). [1] The test is composed of thin and weakly calcified plates, not always continuous.

  5. Echinometra viridis - Wikipedia

    en.wikipedia.org/wiki/Echinometra_viridis

    In Panama, breeding takes place during the period April to December. It does not seem to be correlated with the phases of the moon as in some other sea urchin species. [6] Fertilisation is external and the echinopluteus larvae are planktonic. When these settle, they undergo a rapid metamorphosis into juvenile sea urchins. [4]

  6. Echinocyamus pusillus - Wikipedia

    en.wikipedia.org/wiki/Echinocyamus_pusillus

    Echinocyamus pusillus, commonly known as the pea urchin or green urchin, is a species of sand dollar, a sea urchin in the family Fibulariidae, native to the northeastern Atlantic Ocean and the Mediterranean Sea. It buries itself in gravel or coarse sand at depths down to about 1,250 m (4,000 ft).

  7. Echinothrix calamaris - Wikipedia

    en.wikipedia.org/wiki/Echinothrix_calamaris

    The banded sea urchin has a slightly oval test (shell), reaching a diameter of about 5 cm. [1] Like almost all the Diadematidae (but it is in Echinothrix calamaris that it is most obvious) it has two different sets of spines, short and slender closed spines which go from yellow to dark (through brown) in colour and can deliver a nasty sting, and longer and thicker spines that are often banded ...

  8. Red sea urchin - Wikipedia

    en.wikipedia.org/wiki/Red_sea_urchin

    The red sea urchin (Mesocentrotus franciscanus) [1] is a sea urchin found in the northeastern Pacific Ocean from Alaska to Baja California. It lives in shallow waters from the low-tide line to greater than 280 m (920 ft) deep, [2] and is typically found on rocky shores sheltered from extreme wave action in areas where kelp is available. [3] [4]

  9. Sterechinus neumayeri - Wikipedia

    en.wikipedia.org/wiki/Sterechinus_neumayeri

    Sterechinus neumayeri, the Antarctic sea urchin, is a species of sea urchin in the family Echinidae. It is found living on the seabed in the waters around Antarctica. It has been used as a model organism in the fields of reproductive biology, embryology, ecology, physiology and toxicology. [2]