Diagnosis
Carapace oval with a well-defined incisure and a causal process that can be narrow to elongate. The carapace is smooth and in the majority of species lack lateral ornamentation. On the seventh segment of the first antenna the males have a suctorial disc on two of the setae, and two on the eighth segment have marginal filaments as in the female. The terminal segment of the exopodite of the second antenna carries a large basal and a lateral spine. The endopodite is three-jointed, the first with 3-5 setae, the second with a single lateral seta and the third has a long terminal filament. The causal furca has 8 to 13 pairs of claw spines. The third pair are generally shorter and more slender than the fourth, and the second and fourth are fused with the laemella. The upper lip is divided into anterior and posterior sections. The anterior is undivided, but the posterior part has a long tusk on either side.
Remarks
Thirty-four species have been attributed to this species, of which just one is found in this region at depths of 100-200m.