Triton ensicauda Hallowell, 1861 "1860", Proc. Acad. Nat. Sci. Philadelphia, 12: 494. Syntypes: USNM 7410 (3 specimens), according to Stejneger, 1907, Bull. U.S. Natl. Mus., 58: 21-23, and Cochran, 1961, Bull. U.S. Natl. Mus., 220: 27. Type localities: "Paddyfields at the Amakarima Isle" and "Ralousima . . . the northern half of Ousima proper" (= Amami, Ryukyu Is., Japan, according to Inger, 1947, Fieldiana, Zool., 32: 316). See Stejneger, 1907, Bull. U.S. Natl. Mus., 58: 23, for discussion of confusion surrounding the type localities.
Molge pyrrhogaster var. ensicauda — Boulenger, 1887, Proc. Zool. Soc. London, 1887: 150.
Molge pyrrhogastra var. ensicaudatus — Okada, 1891, Cat. Vert. Animals Japan: 65. Incorrect subsequent spelling.
Molge pyrrhogaster ensicauda — Brown, 1902, Proc. Acad. Nat. Sci. Philadelphia, 54: 186.
Diemictylus ensicauda — Stejneger, 1907, Bull. U.S. Natl. Mus., 58: 21.
Triturus ensicaudus — Dunn, 1918, Bull. Mus. Comp. Zool., 62: 450.
Triton pyrrhogaster subsp. ensicauda — Wolterstorff, 1925, Abh. Ber. Mus. Nat. Heimatkd. Magdeburg, 4: 291.
Triton (Cynops) pyrrhogaster — Wolterstorff, 1927, Bl. Aquar. Terrarienkd., Stuttgart, 19: 484.
Cynops ensicauda — Wolterstorff and Herre, 1935, Arch. Naturgesch., Leipzig, N. F., 4: 224.
Triturus ensicauda — Sato, 1943, Monogr. Tailed Batr. Japan: 378.
Triturus ensicaudus popei Inger, 1947, Fieldiana, Zool., 32: 319. Holotype: FMNH 45039, by original designation. Type locality: "Kin, Okinawa", Ryukyu Islands, Japan.
Triturus ensicaudus ensicaudus — Inger, 1947, Fieldiana, Zool., 32: 319.
Triturus pyrrhogaster ensicaudus — Kawamura, 1950, J. Sci. Hiroshima Univ., B—Zool., 11: 78. by implication.
Triturus (Cynops) pyrrhogaster ensicaudus — Nakamura and Ueno, 1963, Japan. Rept. Amph. Color: 19.
Cynops pyrrhogaster popei — Brame, 1967, Herpeton, California, 2: 6.
Cynops ensicauda ensicauda — Thorn, 1968, Salamand. Eur. Asie Afr. Nord: 281. Dubois and Raffaëlli, 2009, Alytes, 26: 65.
Cynops ensicauda popei — Dubois and Raffaëlli, 2009, Alytes, 26: 65.
Swordtail Newt (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 35).
Sword-tailed Newt (Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 600).
Yellow-bellied Newt (Ananjeva, Borkin, Darevsky, and Orlov, 1988, Dict. Amph. Rept. Five Languages: 31).
Okinawa Newt (Ananjeva, Borkin, Darevsky, and Orlov, 1988, Dict. Amph. Rept. Five Languages: 31).
Amami and Okinawa Archipelagos, Ryukyu Islands, Japan.
See Nakamura and Ueno, 1963, Japan. Rept. Amph. Color: 19-20 (as Triturus pyrrhogaster), and Thorn and Raffaëlli, 2000, Salamand. Ancien Monde: 312-314. for accounts. Hayashi and Matsui, 1988, Zool. Sci., Tokyo, 5: 1121-1136, suggested that Cynops ensicauda is genetically well differentiated from Cynops pyrrhogaster and that Cynops ensicauda formed two well-differentiated geographic groups which correspond to Cynops ensicauda ensicauda and Cynops ensicauda popei. Goris and Maeda, 2004, Guide Amph. Rept. Japan: 40-42, provided an account, map, and photograph. Raffaëlli, 2007, Les Urodèles du Monde: 125-126, provided brief accounts by subspecies, figures, and map. See photograph, map, description of geographic range and habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 600.
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