George and Grindley, 1964
Two distinct, widely separated tooth-like frontal horns, between which the anterior margin of the carapace is visible. Frontal horns tapering to a sharp point. Anterior margin of carapace between frontal horns unarmed, except for the presence, in some species, of a small triangular rostrum and a small denticle near the base of the frontal horns. Carapace without a median ridge behind the cervical groove, but with two submedian ridges, each bearing a row of large, sharply pointed teeth or numerous spinules. A large single median tooth before the cervical groove. Apart from two submedian and two lateral longitudinal rows of spines the posterior half of the carapace is smooth and without spinules. Antennal flagella although large and firm, quite flexible. Antennular plate between bases of antennae hardly, if at all, visible in dorsal view. Stridulating organ absent. First segment of antennular peduncle not over-reaching antennal peduncle. Flagella of antennules short, shorter than last segment of antennular peduncle.First pair of legs not enlarged, with no trace of a pincer, without coloured crossbands; carapace without a scale-like sculpture. Abdominal segments with a sometimes interrupted transverse groove, but without squamiform sculpturation. Pleura of second to fifth abdominal somites ending in two single sharp teeth.
Type Species: by original designation and monotypy: Jasus parkeri Stebbing, 1902.
At present two species are known to belong to this genus, neither is of importance to fisheries On account of the scarcity of available material the taxonomy at the species level is not yet quite clear.