Literature
- Barros, R. B., M. M. Sampaio, M. F. Assis, M. Ayres, and O. Cunha. 1976. General consideration on the karyotype evolution of Chelonia from the Amazon Region of Brazil. Cytologia 41: 559-565.
- Bull, J. J., and J. M. Legler. 1980. Karyotypes of side-necked turtles (Testudines: Pleurodira). Canadian J. Zool. 58: 828-841.
- Ernst, C. H. 1981f. Phrynops gibbus. Catalog. Amer. Amphib. Rept. 279: 1-2.
- Killebrew, F. 1976. Mitotic chromosomes of turtles. II. The Chelidae. Texas J. Sci. 27: 149-154.
- Pritchard, P. C. H., and P. Trebbau. 1984. Turtles of Venezuela. Soc. Stud. Amphib. Rept. 403 pp.
- Schweigger, A. F. 1812. Monographiae Cheloniorum. Königsberg. Arch. Naturwiss. Math. 1: 271-368, 406-458.