Onychodactylus Tschudi, 1838, Classif. Batr.: 57, 92. Type species: Onychodactylus schlegeli Tschudi, 1838 (= Salamandra japonicus Houttuyn, 1782), by monotypy.
Dactylonyx Bonaparte, 1839, Iconograph. Fauna Ital., 2 (Fasc. 26): unnumbered. Manuscript name credited to Bibron and provided as a synonym of Onychodactylus Tschudi.
Onychopus Duméril, Bibron, and Duméril, 1854, Erp. Gen., 9: 113. Substitute name for Onychodactylus Tschudi, 1838.
Geomolge Boulenger, 1886, Proc. Zool. Soc. London, 1886: 416. Type species: Geomolge fischeri Boulenger, 1886, by monotypy. Synonymy by Dunn, 1918, Bull. Mus. Comp. Zool., 62: 454.
Clawed Salamanders (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 28).
From southern Far East Russia and nearby China to Wonsan in Korea and the mountains of Honshu and Shikoku Is., Japan.
Pyron and Wiens, 2011, Mol. Phylogenet. Evol., 61: 543-583, as part of a larger study confirmed the position of Onychodactylus as the sister taxon of remaining Hynobiidae. Poyarkov, Che, Min, Kuro-o, Yan, Li, Iizuka, and Vieites, 2012, Zootaxa, 3465:1-106, revised the genus, redelimited the species, provided a molecular phylogeny, provided the species groups, and discussed the relevant literature, most of which referred populations to species which are restricted by these authors to much more restricted ranges.
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