Azygiida is an order of flatworms belonging to the class Rhabditophora.
Families: Accacoeliidae Odhner, 1911 Aerobiotrematidae Albulatrematidae Aphanhysteridae Aerobiotrematidae Arnolidae Azygiidae Lühe, 1909 Bathycotylidae Dollfus, 1932 Bivesiculidae Yamaguti, 1934 Botulidae Bunocotylidae Cylindrorchiidae Dictysarcidae Skrjabin & Guschanskaja, 1955 Didymozoidae Monticelli, 1888 Halipegidae Hemiuridae Looss, 1899 Hirudinellidae Dollfus, 1932 Isoparorchiidae Travassos, 1922 Lobatovitelliovariidae Mabiaramidae Oesophagicolidae Pelorohelminthidae Ptychogonimidae Dollfus, 1937 Sclerodistomatidae Sclerodistomidae Odhner, 1927 Syncoeliidae Looss, 1899 Tetrasteridae
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