Polycladida

flatworm order

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In flatworm: Annotated classification
Order Polycladida Pharynx simple, bulbose, or plicate (many ridges); intestine may have short diverticula, or pockets; protonephridia paired; testes usually numerous; penis papilla generally present; nervous system with 3–4 trunks; nearly 800 species. Class Monogenea Oral sucker lacking or weakly developed; posterior end with
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