Sources vary on how many species the genus contains. Some consider the rubber boa, C. bottae, to be the sole member of the genus. In addition, some experts consider the southern rubber boa, C. umbratica to be a subspecies of C. bottae. Although the Calabar python, Calabaria reinhardtii has been included in Charina, recent phylogenetic analyses based on DNA have shown that it does not belong to this genus.[4]
References
^ abcdMcDiarmid RW, Campbell JA, Touré T (1999). Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN1-893777-00-6 (series). ISBN1-893777-01-4 (volume).
^ abWright AH, Wright AA (1957). Handbook of Snakes of the United States and Canada. 2 volumes. Comstock Publishing Associates, a division of Cornell University Press. (7th printing, 1985). 1,105 pp. ISBN0-8014-0463-0. (Genus Charina, p. 53).
^Pyron, R. Alexander; Burbrink, Frank T.; Wiens, John J. (2013). "A phylogeny and revised classification of Squamata, including 4161 species of lizards and snakes". BMC Evolutionary Biology13: 93.
Further reading
Gray JE (1849). Catalogue of the Specimens of Snakes in the Collection of the British Museum. London: Trustees of the British Museum. (Edward Newman, printer). xv + 125 pp. (Charina, p. 113).
Kluge AG (1993). "Calabaria and the phylogeny of erycine snakes". Zoological Journal of the Linnean Society107: 293–351. PDF at University of Michigan Library. Accessed 20 July 2008.