APLACOPHORA
Characteristics
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Life Functions
1) bilaterally symmetrical2) They have no shell3) have calcareous spicules in the body surface. 4) The foot is restricted to an anterior pedal 5) shieldhave a radula and a posterior mantle cavity.
-Some are detritus feeders, others are predators.-Closed circulatory system-well-defined nervous system with a primitive brain-have a reproductive system that produces eggs and/or sperm-their digestive system usually includes a jaw, -pharynx, esophagus, stomach, intestine and anus
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