Scleroperalia with one pair of apicalia and 4 pairs of long (max. 65 µm) compound bristles of which the ventralia originate closer to the dorsalia than to the rostralia. Ciliary pits present or lacking. Epidermal cells in stripes of 2-3, epidermal inclusions in furrows between the stripes. Male stylet of the rod type. Sperm small, usually droplet-shaped, or round with a bunch of short filaments. Basal plate winged, with a toothed central part and pronounced lateral and rostral wings. Jaws lamellar and closed, usually with 3 horizontal rows of teeth. Cauda delicate, flanked by a pair of elongated appendages. With a jugum in the upper lip. Without ability to swim backwards.
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