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Stiasny, 1921

Mouth-arms three-winged; network of anastomosing canals issuing from primary ring canal (i.e. not from stomach), communicating with radial canals and only through them ultimately to stomach; subumbrellar muscles annular; rhopalar pits with radial folds; subgenital ostia narrowed by papillae.

Superfamily Inscapulatae
Superfamily Scapulatae

Suborder Daktyliophorae