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Order Haplopharyngida Karling, 1974


Pharynx simplex. Brain encapsulated, two ventro-lateral nerve cords. Ovary single, no accessory organs, female pore posterior to male; male with circle of hard straight stylets, some associated with a glandular accessory organ. Free-living, marine.


Haplopharyngidae Karling, 1965


For some time these were considered part of the Macrostomida.

Order Haplopharyngida