Body and tail elongate, vertebrae 101-146. Branchiostegal membranes attached to isthmus. Interorbital pore present. Single epural, with two rays. Caudal-fin rays 9-11. Suborbital bones 5-6 forming semicircle around eye. Pungent spines at rear of dorsal fin present (rarely absent in one species). Four species, two in North Atlantic and two in northwestern Pacific from sublittoral to outer shelf depths.
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