Ansonia penangensis Stoliczka, 1870, J. Asiat. Soc. Bengal, 39: 152. Syntypes: location not designated; ZSIC 2717-18, 3585-86 considered syntypes by Chanda, Das, and Dubois, 2001 "2000", Hamadryad, 25: 102-103, who discussed them. Sclater, 1892, List Batr. Indian Mus.: 27, listed only 3585-86 and questioned whether they were actually syntypes. Type locality: "on Penang, two near the great water-fall (above Alexandra bath), and two in a narrow gorge about half way up the Penang hill", Malaysia.
Bufo penangensis — Boulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 287.
Bufo (Ansonia) penangensis — Mocquard, 1890, Nouv. Arch. Mus. Natl. Hist. Nat. Paris, Ser. 3, 2: 160.
Ansonia penangensis — Inger, 1954, Fieldiana, Zool., 33: 239. Inger, 1960, Fieldiana, Zool., 39: 476.
Penang Stream Toad (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 39).
Penang Island, Malaysia; see comment.
Quah, Grismer, Muin, and Anuar, 2011, Zootaxa, 2807: 57-64, recollected the species at the type locality and rediagnosed the species, implying that mainland records are referrable to Ansonia malayana and Ansonia jeetsukumarani. Grismer, 2006, Zootaxa, 1327: 1327: 1-27, noted that nominal Ansonia penangensis in West Malaysia is composed of at least two species. Wood, Grismer, Norhayati, and Senawi, 2008, Herpetologica, 64: 321-340, provided comparative information for this and other species from the Malayan Peninsula and implied its restriction to the type locality. See map, description of geographic range and habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 158. Quah, Grismer, Muin, and Anuar, 2011, Zootaxa, 2807: 57-64, recollected the species at the type locality and rediagnosed the species.
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