Bufo pisinnus Mendelson, Williams, Sheil, and Mulcahy, 2005, Sci. Pap. Nat. Hist. Mus. Univ. Kansas, 38: 15. Holotype: UMMZ 233723, by original designation. Type locality: "6.2 mi [10 km] E Apatzingán, 1100 feet [335 m] elevation", Michoacán, Mexico.
Cranopsis pisinna — Frost, Grant, Faivovich, Bain, Haas, Haddad, de Sá, Channing, Wilkinson, Donnellan, Raxworthy, Campbell, Blotto, Moler, Drewes, Nussbaum, Lynch, Green, and Wheeler, 2006, Bull. Am. Mus. Nat. Hist., 297: 364.
Ollotis pisinna — Frost, Grant, and Mendelson, 2006, Copeia, 2006: 558. by implication.
Incilius pisinnus — Frost, Mendelson, and Pramuk, 2009, Copeia, 2009: 418-419. By implication.
Michoacan Toad (Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 18).
Known only from mesquite semidesert grassland in the Tepalcatepec Valley of Michoacán, Mexico.
In the Incilius coccifer complex and confused with Incilius cycladen and Incilius coccifer (all as Bufo) prior to its description, according to the original publication. Mendelson, Mulcahy, Williams, and Sites, 2011, Zootaxa, 3138: 1-34, suggested that Incilius canaliferus is a members in an a monophyletic Incilius coccifer group that includes Incilius coccifer, Incilius cycladen, Incilius ibarrai, Incilius pisinnus, Incilius porteri, and Incilius signifer.
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