Bate, 1888
Eyes entirely absent, or strongly reduced, without pigment. Telson unarmed. Chelipeds very unequal, the larger with fingers more than four times as long as the palm; cutting edges of the fingers of the large cheliped with many slender spines. Fifth pereiopod (at least in the female) with a chela. Abdominal pleura short, quadrangular, lateral margin broad, truncate, not ending in a point. Scaphocerite with several very large teeth on the inner margin.
The family is easily recognized by the peculiar shape of the large cheliped with its swollen palm and the very elongate fingers (at least four times as long as the palm) that have very slender, alternating, large and small teeth.
Two genera with a total of three species known so far.