This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
A. C. Henrici, 2009 - Reassessment of Scaphiopus neuter Kluge, 1966 (Anura: Pelobatoidea: Pelobatidae), based on new material from Anceney, Montana (early Barstovian) - Annals of Carnegie Museum (78), 273-287 (journal article, English)
R. L. Carroll, 1988 - - Vertebrate Paleontology and Evolution (), 1-698 (compendium, English)
J. D. Lynch, 1965 - The Pleistocene amphibians of Pit II, Arredondo, Florida - Copeia (1965), 72-77 (journal article, English)
R. Estes, 1964 - Lower vertebrates from the Valentine Formation of Nebraska - American Midland Naturalist (72), 453-472 (journal article, English)
R. G. Zweifel, 1956 - Two pelobatid frogs from the Tertiary of North America and their relationships to fossil and recent forms - American Museum Novitates (1762), 1-45 (journal article, English)
E. D. Cope, 1875 - Check-list of North American Batrachia and Reptilia; with a systematic list of the higher groups, and an essay on geographical distribution. Based on the specimens contained in the U. S. National Museum - Bulletin of the United States National Museum (1), 1-109 (journal article, English)