Thorius Cope, 1869, Proc. Acad. Nat. Sci. Philadelphia, 21: 111. Type species: Thorius pennatulus Cope, 1869, by monotypy.
Thorius Anonymous, 1869, Am. Nat., 3: 222. Type species: Thorius pennatribus Anonymous (Cope), 1869, by monotypy. See Cope, 1869, Proc. Acad. Nat. Sci. Philadelphia, 21: 111, for authorship.
Mexican Pigmy Salamanders (Liner, 1994, Herpetol. Circ., 23: 15; Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 36).
Pigmy Salamanders (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 34).
Southern Veracruz and Puebla to Guerrero and Oaxaca, west of the Isthmus of Tehuantepec, Mexico.
Hanken, 1983, Copeia, 1983: 1051-1073, discussed genetic variation and taxonomy of the genus. Hanken and Wake, 1994, Copeia, 1994: 573-589, and Hanken and Wake, 1998, Copeia, 1998: 312-345, described several new species. In the tribe Bolitoglossini of Vieites, Román, Wake, and Wake, 2011, Mol. Phylogenet. Evol., 59: 633.
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