Rhacophorus williamsi Guibé, 1974, Bull. Mus. Natl. Hist. Nat. Paris, Ser. 3, Zool., 171: 1178. Holotype: MNHNP 1973.1091, by original designation. Type locality: "Ambohimirandana, massif de l'Ankaratra", Madagascar.
Boophis williamsi — Blommers-Schlösser, 1978, Genetica, 48: 36.
Boophis (Boophis) williamsi — Glaw and Vences, 2006, Organisms Divers. Evol., 6: 242. by implication; Glaw and Vences, 2006, Organisms Divers. Evol., Electron. Suppl., 11(1): 1.
Williams' Bright-eyed Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 111).
Ankaratra Massif of east-central Madagascar, 2100 m elevation.
In the Boophis microtympanum group according to Blommers-Schlösser and Blanc, 1991, Faune de Madagascar, 75: 320-322 and Glaw and Vences, 2006, Organisms Divers. Evol., 6: 240. Glaw and Vences, 2007, Field Guide Amph. Rept. Madagascar, Ed. 3: 152-153, provided an account. 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: 426.
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