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 Hyperolius ocellatus (Günther, 1858) Photo figures 16A–E TYPE LOCALITY .— “Fernando Po”, Bioko , Equatorial Guinea and “ Angola ”. Perret (1975) restricted the type locality to “Fernando Po” by lectotype designation . DISTRIBUTION .— This species ranges over a vast area, from south-eastern Nigeria to Democratic Republic of Congo and southwards to Gabon and Republic of Congo . In Equatorial Guinea , it has been recorded both in Río Muni ( De la Riva 1994 ; Bell et al. 2017 ) and Bioko ( Boulenger 1900 , 1906a ; Mertens 1941 , 1965 ; Hydeman et al. 2017 ; Bell et al. 2017 ) ( Map 17A ). COMMENTS .— Hyperolius ocellatus sensu lato shows a complex phylogeographic structure formed by several lineages ( Bell et al. 2017 ), which need taxonomic revision. Currently, there is one mitochondrial lineage on Bioko, whereas Río Muni could lie in a contact zone between two mainland mitochondrial lineages ( Bell et al. 2017 ). Descriptions of the advertisement calls from Monte Alén were provided by Bosch et al. (2000) . SPECIMENS EXAMINED .— Twenty-nine specimens . Bioko Sur ( Luba ), Moka , ( 3º19´N , 8º40´E ), 25 July 1984 ( 14 specimens with the voucher number EBD 18606 ) ; Ayamiken ( San Joaquín de Ndyiacom ) ( 4 specimens without individual voucher number, EBD 31516 ) , 1990; Caldera de Luba , Campamento Ureca , 11 March 2007 ( MNCN 46720 ) ; Río San Antonio , Caldera de Luba , 13 March 2007 ( MNCN 46725 ) ; northeast of Caldera de Luba , 12 March 2007 ( MNCN 46726 ) ; BBPP camp, Caldera de Luba , Bioko , 03°20ʹ47.32ʺN , 08°29ʹ48.44ʺE , 28 November 2003 ( MNCN 48945– 48946 ) ; Río Iladyi , Bioko , 03°19ʹ46.04ʺN , 08°40ʹ26.13ʺE , 13 November 2003 ( MNCN 48939– 48944 ) .