1. Allis, E.P., The cranial muscles, cranial, first spinal nerves in Amia calva,J. Morphol., 1897, vol. 12, no. 3, pp. 487–808.
2. Allis, E.P., The homologies of the maxillary, vomer bones of Polypterus,Am. J. Anat., 1919, vol. 25, no. 4, pp. 348–394.
3. Allis, E.P., The cranial anatomy of Polypterus, with special reference to Polypterus bichir, J. Anat., 1922, vol. 56, nos. 3–4, pp. 189–294.43.
4. Arratia, G. and Schultze, H.-P., Palatoquadrate and its ossifications: development, homology within osteichthyans, J. Morphol., 1991, vol. 208, no. 1, pp. 1–81.
5. Bemis, W.E., Findeis, E.K., and Grande, L., An overview of Acipenseriformes, Environ. Biol. Fish., 1997, vol. 48, nos. 1–4, pp. 25–72.