Bursovaginoidea with a cuticular bursa and sometimes with a vagina. Usually with a male copulatory stylet consisting of concerntrically arranged rods. Testes paired, situated ventrolaterally. Sperm small (usually about 3 µm, maximally 13 µm), round, polygonal or droplet-shaped, oftyen with a bunch of short filaments. Sensorium consisting of 3-5 pairs of compound bristles and usually one pair of apicalia. Ciliary pits present or reduced.
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