Systematics of the eastern ratsnake complex (Elaphe obsoleta)

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Snakes of the United States and Canada (2003, background): “The text was apparently completed prior to publication of a revision of the Ratsnake Elaphe obsoleta and the consequent elevation of E. o. spiloides to a species (as Elaphe Spiloides) which now includes all Ontario populations (Burbink et al. 2000; Burbink 2001).”
Species Delimitation in Herpetology (2019, background): “…studies that have subdivided broadly distributed geographic species largely on the basis of mtDNA haplotypes (e.g., Bufo valliceps: Mulcahy and Mendelson, 2000; Pantherophis obsoletus: Burbrink, 2001; Pantherophis guttatus: Burbrink, 2002; Drymarchon: Krysko et al., 2016 [see Folt et al., 2018]).”
Verified non-indigenous amphibians and reptiles in Florida from 1863 through 2010: Outlining the invasion process and identifying invasion pathways and stages (2011, background): “The False Map Turtle, Graptemys pseudogeographica (Gray 1831c), is indigenous to the Missouri River system and upper Mississippi River drainages as far north as Minnesota and North Dakota, and as far northeast as Indiana (Ernst & Lovich 2009), and it has been introduced to various non-indigenous loc”