Gnathostomulida with filiform sperm, and without a bursa or vagina. Male opening without an injectory penis. Without paired sensory organs in the rostrum, but with occipitalia. Body usually very elongated (body index at least 25); rostrum pointed and elongated (index usually greater than 3), and not delimited by a sulcus. Pharynx musculature rather loose; jaes more or less compact, with wing-shaped apophyses and a solid symphysis which is usually wider than long.
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