Rafinesque, 1815
ANT I inserted on anterior surface of head; flagellum of male multi-articulate, ART 1 long, straight, other ART short, inserted into ART 1 terminally; flagellum of female 1-articulate. ANT II inserted on anterior surface of head, flagellum of male multi-articulate; flagellum of female short, sometimes rudimentary or absent. All P, especially V, may be prehensile. Telson free.
Four families:
Family Dairellidae Bovallius, 1887
Family Hyperiidae Dana, 1853
Family Phronimidae Rafinesque, 1815
Family Phrosinidae Dana, 1853