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Excerpt from General Evolutionary Patterns and the System of the Class Bivalvia
Food gathering by means of the labial palps restricted the radiation of the Protobranchia. Most members of this superorder (order Nuculida) preserved features characteristic of mobile Bivalvia-an oval or anterior - posteriorly lengthened shell, a mobile foot with a flat sole, 2 adductor muscles, a nuculoid hinge con sisting of chevron-shaped teeth which grow in size in front of and behind the umbo, and primitive double ctenidia with lamellae directed centrally from the axis. The labial palps-the main food gathering organ - and the ligament primarily undergo changes.
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