Family Ophioleucidae Matsumoto, 1915 (restricted)

Type genus

Ophioleuce Koehler, 1904 (type species: O. seminudum Koehler, 1904).

Other genera

Ophiopallas Koehler, 1904, Ophiopyren Lyman, 1878a, Ophiostriatus Madsen, 1983 .

Diagnosis

Tooth sockets as round holes with indistinct borders. Vertebrae with smooth distal muscle flanges. No accessory arm spines. Lateral arm plates with vertical striations, single spur on dorsal part of external proximal/internal distal edge (where adjacent plates overlap). Arm spine articulations with swollen lobes.