Synopsis of the terrestrial Reptiles of Equatorial Guinea Author Sánchez-Vialas, Alberto Author Calvo-Revuelta, Marta 0000-0002-8628-1055 Author Riva, Ignacio De La 0000-0001-5064-4507 albertosv@mncn.csic.es text Zootaxa 2022 2022-11-03 5202 1 1 197 http://dx.doi.org/10.11646/zootaxa.5202.1.1 journal article 182444 10.11646/zootaxa.5202.1.1 45ba25c1-47a9-4001-93d9-294815bf37e7 1175-5326 7285600 BF4831D2-D98B-4265-9138-03DB8607B826 Osteolaemus tetraspis Cope, 1861 Figure 6B Osteolaemus tetraspis Cope, 1861a: 550 . Type locality: “Ogobai River, Western Africa”, Ogooué River , Gabon . Crocodilus frontatus Murray, 1862: 213 . Type locality: “Old Calabar”, Duke Town , Nigeria . Halcrosia afzelii Lilljeborg, 1867: 715 . Type locality: “ Sierra Leone , West Africa ”. Halcrosia nigra Gray, 1867: 200 . Type locality: “ Senegal , Gabon ; Old Calabar ; Ogobai River ”. Distribution. This species occurs from the Ogooué River Basin in Gabon to Nigeria and southwest of the Republic of the Congo . In Equatorial Guinea it has been recorded from Río Muni at Cabo San Juan ( Boulenger 1905 ) and Monte Alén National Park ( Lasso et al. 2002 ), including Monte Mitra Forest ( Gonwouo & Nsang 2005 ) ( Map 1B ). Comments. The taxonomy of the genus Osteolaemus was a complex matter before the molecular characterization of several populations across its distribution ( Eaton et al. 2009 ). Molecular works support three distinct phylogenetic species within Osteolaemus , two of them being O. tetraspis and O. osborni Schmidt, 1919 from the Congo Basin, while the third remains as an undescribed taxon from West Africa ( Eaton et al. 2009 ; Franke et al. 2013 ; Shirley et al. 2015 ). Osteolaemus tetraspis is a intensively harvested species in Río Muni , collected for the bush-meat market (a specimen from Monte Alén is shown in Figure 6B ) ( Fa & García Yuste 2001 ; Fa et al. 2002 ). Specimens examined. Thirteen specimens. Río Muni : likely from Cabo San Juan as part of the material examined by Boulenger (1905) ( MNCN 4171 ) ; without specific locality ( MNCN 45315 , EBD 21046) ; Ayamiken ( EBD 34302) ; Asonga , 20 April 1986 ( EBD 20912) ; Niefang , Cuenca del Uolo , 25 March 1987 ( EBD 24934) ; Niefang Norte ( EBD 20282) ; San Joaquín de Ndyiacom , 25 March 1987 ( EBD 24935) , September 1987 ( EBD 27485) ; Bata , 31 August 1986 ( EBD 24933) ; Bata , bought at the airport ( EBD 20281) ; Punta Mbonda ( EBD 334 ) ; Río Aye , camping of Alena , 13 June 1964 ( EBD 2897 ) .