Sea Urchin
Sea Urchin in Jamaica (Caribbean).
⭐Facts about Sea Urchin
Sea urchins are spiny, globular echinoderms in the class Echinoidea. The sea urchin live on the seabed of every ocean and inhabit every depth zone.
The spherical, hard shells (know as tests) of sea urchins are round and spiny, ranging in diameter from 3 to 10 cm (approximately 1 to 4 in).
They do not have eyes or eye spots, the entire body of most regular sea urchins might function as a compound eye.
You can pick up most sea urchins without getting harmed. However, some have sharp venomous spines that can cause painful puncture wounds.
They have no legs, or means of propulsion and they may appear to be incapable of moving but they move slowly, crawling with adhesive tube feet in combination with their spines.
The Sea urchins move in a way similar to that of starfish; regular sea urchins do not have any favourite walking direction.
Sometimes the most visible sign of life is the spines, which are attached to ball-and-socket joints and can point in any direction.
Sea urchins are sensitive to touch, light, and chemicals.
The nervous system of sea urchins has a relatively simple layout. With no true brain, the neural center is a large nerve ring encircling the mouth just inside the lantern.
In most urchins, touch elicits a prompt reaction from the spines, which converge toward the touched point.
They are dioecious, having separate male and female sexes, although no distinguishing features are visible externally.
Although Algae are the primary diet, sea urchins also eat slow-moving (sessile) animals.
Sea urchins are eaten by lobsters, crabs, sea otter, starfish, wolf eel, triggerfish and human beings. In some cultures, The gonads of sea urchins are considered a delicacy. They can be eaten raw, cooked, or dried.
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