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fact about sea shell? The tube like feet, protrude through pores in the test. The pores are arranged in a five double bands reflecting sea urchins’ five fold symmetry. If one holds an empty urchin shell and lifts it to the light, the bandings of small pin size holes will be seen. The feet do not only provide movement but some are used for sensing, attachment, feeding and breathing.

More fact about sea shell

Located at the shells apex is the mouth which contains the Aristotle’s lantern. The Aristotle’s lantern controls the manipulation of the teeth. The teeth are used to graze the rockfaces. When finding a empty test it is worth shaking, as often the Aristotle’s lantern is trapped inside, this can be shaken out for study.



Locomotion fact about sea shell

Sea urchins have tubed feet, each foot ending in a sucker. These suckers are used to grip the surface, the feet then contract so moving the urchin. This locomotion is driven by a water vascular system. This is a hydraulic system, water is pumped to the tubed feet or from them, so enabling extension or contraction. Read more about the fact about sea shell