Scleroperalia without paired apicalia, but with 5 pairs of short (30 µm) compound bristles, of which the ventralia originate closer to the rostralia than to the dorsalia. Ciliary pits present. With an unpaired prepgaryngeal gland. Epidermis not in stripes, epidermal inclusions scattered. Male stylet of the rod type. Sperm small, round or polygonal, usually with a bunch of short filaments. Basal plate usually lacking. Jaws lacking or very delicate, lamellar but not closed, without a caus=da, but with a solid symphysis; with teeth connected basally by a cuticular membrane and arranged in a ventro-rostral bow. Without a jugum. With ability to swim backwards.
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