adaptive radiation in flat worms
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striking example is the radiation, beginning in the Paleogene Period (beginning 66 million years ago), of basal mammalian stock into forms adapted to running, leaping, climbing, swimming, and flying.
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Because of their body shape and metabolic requirements, early flatworms must have been predisposed toward parasitism and gave rise to symbiotic descendants in the Neodermata. These descendants radiated abundantly as parasites, and many flatworms became very highly specialized for that mode of existence.
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