Yes: while most members of their phlyum, echinodermata (which includes all sea stars and sea cucumbers), have some kind of defensive toxin, only a few are capable of hurting humans. Certain species of both long- and short-spined sea urchins are venomous. Some inject venom only when their spines puncture the skin, some can sting with venom glands on the surface of the spine tips, and some have special jaw-like appendages called pedicellaria that can grasp the skin and inject venom through “fangs.” Pedicellaria and any part of a sea urchin should be removed from one’s skin right away, as they can continue injecting venom even when broken off from the animal.
These poisons can still be a problem for people who eat sea urchins or urchin roe. As with blowfish (fugu), one should never eat sea urchin unless an expert is picking the correct species and preparing it properly. Poisoning from ingestion or stinging is rarely fatal, but can cause lingering and intense pain.
Sea urchins belong to the species Echinoidea. Sea Urchins are very interesting and differing animals that includes some that can cause human injury. They eat algae and are prey to eels, sea otters, and humans seeking their roe as delicacy. Ssea Urchins, surprisingly, are not invertebrae. It is their spines that are potentially harmful. Though very few deaths have been caused, the spines have venom that can cause pain and infection.
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