Opisthothylax immaculatus (Boulenger, 1903)

TYPE LOCALITY.— “Cap Saint-Jean”, Cabo San Juan, Río Muni, Equatorial Guinea .

DISTRIBUTION.— This species ranges from Nigeria to Gabon, Democratic Republic of Congo and Republic of Congo. In Equatorial Guinea, it was recorded in Río Muni by Boulenger (1903), at the type locality (Map 19A) .

COMMENTS.— We provide the first record of the genus Opisthothylax on Bioko although Portik et al. (2019) sequenced a specimen they listed as coming from Bioko in their online Supplemental Table 1 to their paper (said to be accessible but not verified by us [IDLR]).

SPECIMENS EXAMINED.— Pico Basilé, Bioko, 01 February 1933 (MNCN 3915).