Hynobius nigrescens Stejneger, 1907, Bull. U.S. Natl. Mus., 58: 34. Holotype: TIU 57A, lost by implication of statements by Maeda and Matsui, 1990, Frogs Toads Japan, Ed. 2, that collection destroyed in WWII. Type locality: "Sendai, [Rikuzen Province,] Hondo [= Honshu I.], Japan".
Hynobius fuscus Tago, 1907, Zool. Mag., Tokyo, 19: 204, 233. Syntypes: Presumably originally TIU, now lost; by implication of statements by Maeda and Matsui, 1990, Frogs Toads Japan, Ed. 2, that collection destroyed in WWII. Type locality: Mt. Nikko, Tochigi Pref., Shimozuke Province, Honshu I., Japan. Synonymy by Okada, 1937, Saito Ho-on Kwai Mus. Res. Bull., 12: 182; Sato, 1940, Bull. Biogeogr. Soc. Japan, 10: 164. Thorn, 1968, Salamand. Eur. Asie Afr. Nord: 38, suggested that this name also belonged in the synonymy of Hynobius retardatus.
Hynobius sadoensis Sato, 1940, Bull. Biogeogr. Soc. Japan, 10: 163. Syntypes: Possibly ZIHU according to Brame, 1972, Checklist Living & Fossil Salamand. World (Unpubl. MS): 15. Type locality: "Sado Island", Japan. Synonymy by Nakamura and Ueno, 1963, Japan. Rept. Amph. Color: 10, and Matsui, Iwasawa, Takahashi, Hayashi, and Kumakura, 1992, J. Herpetol., 26: 308-315.
Hynobius (Hynobius) nigrescens — Nakamura and Ueno, 1963, Japan. Rept. Amph. Color: 9.
Sendai Salamander (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 28).
Japanese Black Salamander (Goris and Maeda, 2004, Guide Amph. Rept. Japan: 22).
North-central to northern Honshu I. as well as on Sadogashima Island, Japan, 0-2500 m elevation.
In the Hynobius lichenatus group. Hynobius peropus may be an older name for this species. Thorn and Raffaëlli, 2000, Salamand. Ancien Monde: 56-61, and Raffaëlli, 2007, Les Urodèles du Monde: 49-50, provided brief accounts. Yang, Kim, Min, and Suh, 2001, Monogr. Korean Amph.: 444-45, provided an account and map for an unnamed sibling species in southeastern South Korea. Goris and Maeda, 2004, Guide Amph. Rept. Japan: 22-24, provided an account, map, and photograph.
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