Synopsis of the Amphibians of Equatorial Guinea based upon the Authors’ Field Work and Spanish Natural History Collections Author Sánchez-Vialas, Alberto Museo Nacional de Ciencias Naturales (MNCN-CSIC), C / José Gutiérrez Abascal, 2. 28006, Madrid, Spain; Author Calvo-Revuelta, Marta Museo Nacional de Ciencias Naturales (MNCN-CSIC), C / José Gutiérrez Abascal, 2. 28006, Madrid, Spain; Author Castroviejo-Fisher, Santiago Laboratorio de Sistemática de Vertebrados, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). Av / Ipiranga, 6681, Prédio 40, sala 110, 90619 - 900, Porto Alegre, Brazil; * Corresponding author: IDlR (iriva @ mncn. csic. es) Author De, Ignacio Museo Nacional de Ciencias Naturales (MNCN-CSIC), C / José Gutiérrez Abascal, 2. 28006, Madrid, Spain; text Proceedings of the California Academy of Sciences 2020 2020-03-31 66 8 137 230 journal article 295393 10.5281/zenodo.11105986 4c7b4d3d-1fbe-4f48-8cb2-002e928eae42 0068-547X 11105986 Arthroleptis bioko Blackburn, 2010 TYPE LOCALITY .— “ Republic of Equatorial Guinea , Bioko Norte Province , along Pico Basilé road, northeast slope of Pico Basilé , 03°37′42.4″N , 08°48′11″E , ca. 1820 m elevation” . DISTRIBUTION .— This species was known only from some localities of the Pico Basilé region ( Blackburn 2010 ), from where it was presumably endemic, but we record an additional population from Bioko Sur province , close to Caldera de Luba surroundings ( Map 2B ). COMMENTS .— This species is currently the only known endemic amphibian of Equatorial Guinea . The additional record provided herein represents the southernmost known locality for this species. The identity of the single examined specimen, a female, was also confirmed by molecular analyses (authors unpublished data). SPECIMENS EXAMINED .— One specimen . Narciso’s farm, Moka, Bioko, 03°20ʹ53.57ʺN , 08°39ʹ49.91ʺE , 12 November 2003 ( MNCN 48835 ) .