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Acotylea
Suborder, Flatworm (Turbellaria), Marine
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Cotylea
Suborder, Flatworm (Turbellaria), Marine
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Dalytyphloplanida
Suborder, Flatworm (Turbellaria), Freshwater, marine, terrestrial
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Typhloplanoida
Suborder, Flatworm (Turbellaria), Terrestrial
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