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7] M RA as gastrulae, the ventral elements of all seven arches can be found (Meckel's cartilage in the mandibular arch, the ceratohyal in the hyoid arch, and the ceratobranchials in the branchial arches).
They possess a typical balistoid (Balistidae, Monacanthidae, and the Ostraciidae) hyoid arch with no hypertrophy of the first branchiostegal ray or the associated hyohyoideus abductor muscle, and the pectoral girdle is unmodified relative to other file fishes (Matsuura 1979; Tyler 1980).