Skull and mesethmoid of Colaptes campestris at days 11–12 (A–C) and days 27–28 (D–F). A skull in ventral view, B detail of the relationship between os epioticum and os supraoccipitale in caudolateroventral view, C os mesethmoidale in cranial view, D skull in ventral view, E os mesethmoidale in cranial view. Scale bar: 5 mm.