Astylosternus diadematus Werner, 1898, Verh. Zool. Bot. Ges. Wien, 48: 200. Holotype: ZMB 13920 according to J.-L. Amiet in Frost, 1985, Amph. Species World: 21. Type locality: "Victoria [now Limbé], Kamerun".
Victoria Night Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 37).
Western and southwestern Cameroon, and possibly in extreme eastern Nigeria, at elevations of 250-1100 m.
In the Astylosternus diadematus group of Amiet, 1978 "1977", Ann. Fac. Sci. Cameroun, 23-24: 99-227. Schiĝtz, 1963, Vidensk. Medd. Dansk Naturhist. Foren., 125: 47-48, provided records for Nigeria. 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: 149.
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