(after https://biodiversity.org.au/afd/taxa/ARMADILLIDIIDAE): Dorsal surface of body strongly convex; animal can conglobate. Body outline not interrupted between pereon and pleon. Head with raised triangular shield on frons. Eye compound in Armadillidium, of one ommatidium in Eluma. Antenna 2 flagellum with 2 articles. No endolobes on pereon in Armadillidium; posterolateral angle of epimeron 1 cleft in Eluma. Pleopodal lungs present in exopods of pleopods 1 and 2. Telson subquadrangular or subtriangular with apex blunt. Uropod with exopod flattened and occupying space between pleural epimeron 5 and telson.