Milne-Edwards, 1830
Body dorsoventrally flattened, especially in male. Coxal plates short and scarcely contiguous; plate 2 and 5 longer than rest. Head elongate, lateral lobes very large, prolonged, apically acute. Mouthparts basic; upper lip entire, lower lip with inner lobes well developed; mandible with large triturative molar, palp robust, distal article broad, setose; maxilliped inner and outer plates well developed, palp slender. Antennae about equal, slender, ventral margins with long setae; accessory flagellum absent. Gnathopod 1 in male and gnathopods 1 and 2 in female subchelate; gnathopod 2 in male very large and complexly carpochelate. Pereiopods 3 and 4 basis broadly oval. Uropods 1 and 2 biramous, spinose; uropod 3 uniramous, ramus much shorter than peduncle, apex with minute reverted denticles. Telson broad, bilobed, surface minutely spinulose.
A northern hemisphere genus of tube-dwelling species, typically found in littoral habitats.
Source: Lincoln, 1979.