The lower jaw is slender, nearly straight, 2-3 and without a coronoid process or inflected angle.
Supra-angular and coronoid splint-bones serve for the insertion of part of the temporal or masseter muscle.
No ectopterygoid pterygoid not extending to quadrate; no supratemporal or squamosal; prefrontal forming a suture with nasal; coronoid present; vestiges of pelvis present.
The mandible is toothed but has no coronoid bone.
The prefrontal bones are still in contact with the nasals as in the previous families, but the coronoid bones of the mandibles are absent as in the remaining families, and this loss also occurs in the Boine Charina.