Literature
- Cope, E. D. 1865. Third contribution to the herpetology of tropical America. Proc. Acad. Natur. Sci. Philadelphia 17: 185-198.
- Duellman, W. E. 1963. Amphibians and reptiles of the rainforests of southern El Petén, Guatemala. Univ. Kansas Publ. Mus. Natur. Hist. 15: 205-249.
- Ewert, M. A. 1979. The embryo and its egg: development and natural history. In: M. Harless and H. Morlock (eds.), Turtles: Perspectives and Research, pp. 333-413. Wiley-Interscience, New York.
- Flores-Villela, O. A., and G. R. Zug. 1995. Reproductive biology of the Chopontil, Claudius angustatus (Testudines: Kinosternidae), in southern Veracruz, México. Chelonian Conserv. Biol. 1(3): 181-186.
- Gorman, G. C. 1973. The chromosomes of the Reptilia, a cytotaxonomic interpretation. In: A. B. Chiarelli and E. Capanna (eds.), Cytotaxonomy and Vertebrate Evolution, pp. 349-424. Academic Press, New York.
- Iverson, J. B., and J. F. Berry. 1980. Claudius, C. angustatus. Catalog. Amer. Amphib. Rept. 236: 1-2.
- Moon, R. G. 1974. Heteromorphism in a kinosternid turtle. Mammalian Chromosome Newsletter 15: 10-11.
- Pritchard, P. C. H. 1979. Encyclopedia of turtles. T. F. H. Publ., Inc., Neptune, New Jersey. 895 pp.
- Smith, H. M., and R. B. Smith. 1979. Synopsis of the herpetofauna of Mexico. Vol. 6. Guide to Mexican turtles. John Johnson, North Bennington, Vermont. 1044 pp.