A family of deep-water asteroids, already recorded from Australia but not hitherto known from New Zealand. The familial characters include:

Rays five, long, stiff, tapering, with longitudinal series of abactinal plates, among which the carinals are prominent and carry a prominent spine. Primary plates prominent on the disc. Adambulacral plates of alternating large and small types, the large type projecting into the furrow like a keel, a keel on one side of the furrow occurring opposite a small adambulacral plate on the other side. Pedicellariae straight, never crossed.