Gnathostomulida with a bursa and often a vagina; sperm not filiform. Male opening with an injectory penis. With paired sensory organs on the rostrum, and with occipitalia. Body elongated to fairly plump (index smaller than 25); rostrum rather blunt, often plump (index usually smaller than 3), and mostly delimited by a sulcus. Pharynx musculature concentrated; jaws open-lamellar to fused-lamellar, without wing-shaped apophyses; solid symphysis, if present, longer than wide. Exceptionally, basal plate and jaws are lacking.
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