Opisthothylax immaculatus (Boulenger, 1903)

Class: Amphibia > Order: Anura > Family: Hyperoliidae > Genus: Opisthothylax > Species: Opisthothylax immaculatus

Megalixalus immaculatus Boulenger, 1903, Mem. R. Soc. Esp. Hist. Nat., 1: 63. Syntypes: BMNH (2 specimens), by original designation. Type locality: "Escalera au Cap Saint-Jean", Equatorial Guinea.

Megalixalus immaculatusNoble, 1924, Bull. Am. Mus. Nat. Hist., 49: 270.

"Heterixalus" immaculatusPerret, 1960, Rev. Zool. Bot. Afr., 61: 372.

"Megalixalus" immaculatusSchiøtz, 1963, Vidensk. Medd. Dansk Naturhist. Foren., 125: 61.

Opisthothylax immaculatusPerret, 1966, Zool. Jahrb., Jena, Abt. Syst., 93: 445.

English Names

Gray-eyed Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 69).


Southeastern Nigeria through southern Cameroon and Equatorial Guinea to Gabon, western Rep. Congo, and southwestern Dem. Rep. Congo; possibly in to southwestern Central African Republic.


See account for Cameroon by Amiet, 2012, Rainettes Cameroun: 413-422. Schiøtz, 1999, Treefrogs Afr.: 312–313, provided a brief account and map. Channing, Rödel, and Channing, 2012, Tadpoles of Africa: 242, provided information on comparative larval morphology. Jongsma, Tobi, Dixon-MacCallum, Bamba-Kaya, Yoga, Mbega, Mve Beh, Emrich, and Blackburn, 2017, Amph. Rept. Conserv., 11 (1: e144): 14, provided a record for southeastern Gabon and briefly discussed habitat and range. 

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