A type catalogue of the reed frogs (Amphibia, Anura, Hyperoliidae) in the collection of the Museum fuer Naturkunde Berlin (ZMB) with comments on historical collectors and expeditions Author Tillack, Frank Museum fuer Naturkunde Berlin, Leibniz-Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany Author Ruiter, Ronald de Nederlands Openluchtmuseum, Hoeferlaan 4, 6816 SG Arnhem, The Netherlands Author Roedel, Mark-Oliver https://orcid.org/0000-0002-1666-195X Museum fuer Naturkunde Berlin, Leibniz-Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany mo.roedel@mfn-berlin.de text Zoosystematics and Evolution 2021 2021-08-10 97 2 407 450 http://dx.doi.org/10.3897/zse.97.68000 journal article http://dx.doi.org/10.3897/zse.97.68000 1860-0743-2-407 DC2EBA6293A141938ADC2A79F7D658B9 9446F0CE40A752B4897F7B7B71BBFD29 Hyperolius oeseri Ahl, 1931a: 51. Holotype. ZMB 31867, "Grand Bassa, Liberia" [Grand Bass County, Liberia], coll. Richard Oeser. Present name. Hyperolius fusciventris Peters, 1876. Remarks. The German physician Dr. Oeser undertook various journeys, e.g. to East Asia and Indonesia (1923 as a ship's doctor), to the USA (1925), to Central America and northern South America (1931-32) as well as to Cameroon (1936). In spring 1928 he undertook a journey along the West African coast, collecting in Benin, Nigeria, Fernando Po , Sao Tome and Principe, Angola, Namibia and Liberia. He collected the type material of H. oeseri and Hyperolius trifasciatus Ahl (see below). A large part of his collection was sold through the zoological wholesaler "Scholze & Peotzschke" in Berlin ( Mertens 1975 ).