Cornufer johnstoni Boulenger, 1888 "1887", Proc. Zool. Soc. London, 1887: 564. Holotype: BMNH. Type locality: "Rio del Rey" (= river Ndian), western Cameroon.
Tympanoceros newtoni Bocage, 1895, J. Sci. Math. Phys. Nat., Lisboa, Ser. 2, 3: 270. Holotype: Not found in the MBL by Perret, 1976, Arq. Mus. Bocage, Ser. 2, 6: 21, so presumably lost at that time; should it have been in MBL it would have been destroyed in 1978 fire. Type locality: "L'ile de Fernão do Po dans le golfe de Guiné". Synonymy by Barej, Rödel, Gonwouo, Pauwels, Böhme, and Schmitz, 2010, Zootaxa, 2340: 4.
Cornufer johnstoni — Werner, 1898, Verh. Zool. Bot. Ges. Wien, 48: 200. In error considered a new name and junior primary homonym of Cornufer johnstoni Boulenger, 1888, Parker, 1936, Proc. Zool. Soc. London, 1936: 147., when it is actually a subsequent usage of the senior name.
Petropedetes johnstoni — Boulenger, 1900, Proc. Zool. Soc. London, 1900: 439. Deckert, 1938, Sitzungsber. Ges. Naturforsch. Freunde Berlin, 1938: 149.
Petropedetes newtoni — Boulenger, 1900, Proc. Zool. Soc. London, 1900: 439. Perret, 1976, Arq. Mus. Bocage, Ser. 2, 6: 21; Nieden, 1908, Mitt. Zool. Mus. Berlin, 3: 500; Deckert, 1938, Sitzungsber. Ges. Naturforsch. Freunde Berlin, 1938: 149.
Johnston's Water Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 103).
Newton's Water Frog (Petropedetes newtoni [no longer recognized]: Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 103).
Lowland forest and mangrove forest on the coastal plain of southwestern and southern Cameroon, Gabon, Bioko, and Equatorial Guinea.
See comment under Petropedetes parkeri. See statement of geographic range, habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 627. De la Riva, 1994, Rev. Esp. Herpetol., 8: 132, provided a record (as Petropedetes newtoni) for Equatorial Guinea. Frétey and Blanc, 2001, Bull. Soc. Zool. France, 126: 386, reported this species (as Petropedetes newtoni) from Gabon. Lasso, Rial, Castroviejo, and De la Riva, 2002, Graellsia, 58: 21-34, provided notes (as Petropedetes newtoni)on ecological distribution in Equatorial Guinea. Barej, Rödel, Gonwouo, Pauwels, Böhme, and Schmitz, 2010, Zootaxa, 2340: 4-13, provided an account and revision.
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