Classfication
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Morphology
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Biology Tube feet elsewhere on the body are smaller and are used for feeding and locomotion. Individuals live subtidally, just beyond the surf, and flat on the bottom or at an angle and partly buried. They frequently move around if they are lying flat. If a current is present they usually lie at an angle and partly buried. In very rough water most lie flat and partly buried. Adults feed on detritus and diatoms swept to the mouth by cilia. If lying at an angle, it also catches small prey and algae with its pedicellariae, tube feet, and spines and passes them to the mouth. Their mouth includes a small aristotle's antern. Sometimes settled on by a small barnacle Balanus pacificus.Fertilization is external. Juveniles swallow heavy sand grains, especially those with iron, which may help serve as a "weight belt. |
Facts
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Vocabulary
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