Plagiorchida

flatworm order

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In flatworm: Annotated classification
Order Plagiorchida Cercaria typically armed with a stylet; encystment in invertebrates, rarely vertebrates; excretory vessels not open to the exterior. Most representatives require 3 hosts to complete one life cycle. Many hundreds of species. Order Opisthorchiida Cercaria never armed; excretory pores open on margins of tail;…
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