Hylambates calcaratus Boulenger, 1906, Ann. Mag. Nat. Hist., Ser. 7, 17: 322. Syntypes: BMNH, by original designation. Type locality: "Efulen", Cameroon, and "Cape St. John and the Rio Benito District (Spanish West Africa [= Equatorial Guinea]".
Leptopelis calcaratus — Noble, 1924, Bull. Am. Mus. Nat. Hist., 49: 234, 237, 332.
Leptopelis (Leptopelis) calcaratus — Laurent, 1941, Rev. Zool. Bot. Afr., 35: 94.
Leptopelis calcaratus calcaratus — Laurent, 1973, Ann. Mus. R. Afr. Cent., Tervuren, Ser. Octavo, Sci. Zool., 202: 50.
Leptopelis calcaratus meridionalis Laurent, 1973, Ann. Mus. R. Afr. Cent., Tervuren, Ser. Octavo, Sci. Zool., 202: 50. Holotype: MRAC 115147, by original designation. Type locality: "Omaniundu, Terr. de Lodja, Sankuru, Zaïre".
Efulen Forest Treefrog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 69).
Dense forest from southeastern Nigeria through southern Cameroon to eastern Dem. Rep. Congo, south through much of Gabon and northern Rep. Congo.
De la Riva, 1994, Rev. Esp. Herpetol., 8: 130, provided a record for Equatorial Guinea. Lasso, Rial, Castroviejo, and De la Riva, 2002, Graellsia, 58: 21-34, provided notes on ecological distribution in Equatorial Guinea. Schiĝtz, 1963, Vidensk. Medd. Dansk Naturhist. Foren., 125: 87, provided records for Nigeria. Frétey, Barriere, and Ohler, 2006, Herpetol. Rev., 37: 358, provided a record for the Central African Republic and delimited the range. Jackson and Blackburn, 2007, Salamandra, 43: 149-164, provided a record for Nouabale-Ndoki National Park, Rep. Congo. See account for Cameroon by Amiet, 2012, Rainettes Cameroun: 492-498.
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