(from Australian Faunal Directory; biodiversity.org.au/afd/taxa/LIGIIDAE ): Dorsal surface of body shallowly convex; animal does not conglobate. Eye with many ommatidia in Ligia; eye of moderate size in Ligidioides. Antenna 1 with 3 articles. Antenna 2 flagellum with more than 10 articles in Australasian species. Mandible with molar process. Maxillipedal palp with 5 articles. Pereonal epimera 2–7 (coxae) fused to corresponding tergites (although suture lines may be visible in female). Dactylar organ present on each pereopod in Ligia. Male with pair of penes. Pleopod 2 of male modified as copulatory structure. Without pleopodal lungs. Uropod attached terminally and projecting beyond telson; rami styliform.