Richmond C. W., 1900: Description of a new bird of the genus Dendrornis. 2 pp. 

 Richmond C. W., 1900: Descriptions of three new birds from Lower. 3 pp. 

 Richmond C. W., 1902: List of generic terms proposed for birds during the years 1890 to 1900, inclusive, to which are added names omitted by Waterhouse in his “Index Generum Avium”. 67 pp. 

 Richmond C. W., 1903: Birds collected by Dr. W. L. Abbott and Mr. C. B. Kloss in the Andaman and Nicobar islands. 28 pp. 

 Richmond C. W., 1903: Birds collected by Dr. W. L. Abbott on the Coast and Islands of Northwest Sumatra. 40 pp. 

 Richmond C. W., 1909: Generic names applied to birds during the years 1901 to 1905, inclusive, with further additions to Waterhouse‘s „Index generum avium.“ 71 pp. 

 Richmond C. W., 1917: Generic names applied to birds during the years 1906 to 1915, inclusive, with additions and corrections to Waterhouse’s “Index Generum Avium”. 72 pp. 

 Richter M., Breitkreuz C., 1997: Permian fish remains from the peine formation of northern Chile. 14 pp. 

 Ridgway R., 1889: A review of the genus Sclerurus of Swainson. 11 pp. 

 Ridgway R., 1889: A review of the genus Xiphocolaptes of Lesson. 20 pp. Proceedings of the United States National Museum for the year 1889. Volume XII.

 Ridgway R., 1889: Scientific results of explorations by the U. S. Fisch Commission Steamer Albatross. No. I. – Birds collected on the Galapagos Islands in 1888. 39 pp. 

 Ridgway R., 1890: Observations on the Farallon rail (Porzana jamaicensis coturniculus Baird). 3 pp. 

 Ridgway R., 1896: Characters of a new American family of Passerine birds. 2 pp. 

 Ridgway R., 1896: Description of a new species of ground warbler from Eastern Mexico. 2 pp. 

 Ridgway R., 1896: Description of a new subspecies of the genus Peucedramus, Coues. 1 pp. 

 Ridgway R., 1896: On birds collected by Doctor W. L. Abbott in the Seychelles, Amirantes, Gloriosa, Assumption, Aldabra, and adjacent islands, with notes on habits, etc., by the collector. 38 pp. 

 Ridgway R., 1896: Preliminary description of some new birds from the Galapagos Archipelago. 2 pp. 

 Riedel G. R., 1989: Skelettelemente von Nothosaurier-Material der Sammlung Friedrich Wagner in den Beständen des Naturkundemuseums Erfurt. 10 pp. Veröffentlichungen des Naturkundemuseum Erfurt 8: 3-12.

 Riedel G. R., 2011: Schmelzschupperfische (Palaeonisciden) aus dem Rotliegend vom Steinbruch „Gottlob“ bei Friedrichroda Thüringen in den Sammlungen des Naturkundemuseums Erfurt. 10 pp. (in German). Vernate 30: 19-28.

 Riedel G.-R., 2007: Fischzähne aus dem Oberen Muschelkalk Thüringens in den Sammlungen des Naturkundemuseums Erfurt. 6 pp. (in German). Veröffentlichungen des Naturkundemuseum Erfurt 26: 33-38.

 Riff D., Kellner A. W. A., 2001: On the dentition of Baurusuchus pachecoi price (Crocodyliformes, Metasuchia) from the upper cretaceous of Brazil. 15 pp. (in English). Boletim do Museu Nacional (N.S.) Geologia 59: 1-15.

 Riley J. H., 1905: A new subspecies of ground dove from Mona Island, Porto Rico. 2 pp. 

 Riley J. H., 1919: Annotated catalogue of a collection of birds made by Mr. Copley Amory, Jr., in northeastern Siberia. 20 pp. 

 Riley J. H., 1926: A collection of birds from the provinces of Yunnan and Szechwan, China, made for the National Geographic Society by Dr. Joseph F. Rock. 70 pp. 

 Riley J. H., 1929: A review of the birds of the islands of Siberut and Sipora, mentawi group (Spolia mentawiensia). 46 pp. 

 Riley J. H., 1930: Birds collected in inner Mongolia, Kansu, and chihli the National Geographic Society’s Central- China expedition under the direction of F. R. Wulsin. 39 pp. 

 Riley J. H., 1930: Birds from the small islands off the Northeast Coast of Dutch Borneo. 24 pp. 

 Riley J. H., 1931: A second collection of birds from the provinces of Yunnan and Szechwan, China, made for the National Geographic Society by Dr. Joseph F. Rock. 91 pp. 

 Ritter R., 1911: Abdruck aus den Verhandlungen des 8. Internationalen Zoologen-Kongresses zu Graz. 20 pp. (in German). Nicht einzeln im

 Riva I. De la, 1990: Lista preliminar comentada de los amfibios de Bolivia con datos sobre su distribución. 59 pp. Bolletino del Museo regionale di Scienze Naturali – Torino 8(1): 261-319.

 Robinson W., 1895: An annotated list of birds observed on the Island of Margarita, and at Guanta and Laguayra, Venezuela. 38 pp. 

 Robinson W., Richmond C. W., 1902: An annotated list of birds collected in the vicinity of La Guaira, Venezuela. 16 pp. 

 Rocha L. A., Rosa I. L., Rosa R. S., 1998: Peixes recifais da costa da Paraíba, Brasil. 14 pp. Revta bras. Zool. 15(2): 553-566.

 Roček Z., 1988: List of fossil amphibians of Czechoslovakia. 28 pp. [80592] Acta zoologica cracoviensia

 Roda S. A., Farias Á. M. I., 1999: Aves silvestres infestadas por Phthiraptera (Insecta) na Zona da Mata Norte de Pernambuco, Brasil. 8 pp. Revta bras. Zool. 16(3): 871-878.

 Rodrigues de Melo F., Barbosa E. F., Ionseca se Souza S. L., da Silva Ferraz D., dos Reis Rodes É., Machado de Souza S., Faria M. B., da Silva Nery M., Cosenza B. A. P., Lima F. S., 2005: Redescoberta do jupará, Potos flavus Schreber, 1774 (Carnivora: Procyonidae) no Estado de Minas Gerais, Sudeste do Brasil. [Rediscovery of kinkajou, Potos flavus Schreber, 1774 (Carnivora: Procyonidae) in Minas Gerais State, southeastern Brazil.] 9 pp. Boletim do Museu de Biologia ‘Mello Leitao’ (N.S.) 18: 49-57.

 Rodrigues E. L., Fanta E., 1998: Liver histopathology of the fish Brachydanio rerio Hamilton-Buchman after acute exposure to sublethal levels of the organophosphate Dimethoate 500. 10 pp. Revta bras. Zool. 15(2): 441-450.

 Rodrigues F. H. G., Silveira L., Jácomo A. T., Monteiro-Filho E. L. A., 1999: Um albino parcial de veado campeiro (Ozotoceros bezoarticus, Linnaeus) na Parque Nacional das Emas, Goiás. 4 pp. Revta bras. Zool. 16(4): 1229-1232.

 Rodríguez H. O., Rodríguez V. H. R., 1983: Charadrisu collaris, Viellot 1818, inverna en la Bahia de concepcion (Aves: Charadriidae). 5 pp. 

 Rodríguez-Llano J. A., 1990: Uso del espacio por diversas especies de aves en los jardines de la Granja: importancia de la estructura de la vegetación y de las especies arbóreas. 6 pp. 

 Rodríguez-Teijeiro J. D., Pigcerver M., Ortiz C., Gallego S., Nadal J., 1997: Incubation behaviour of the common quail (Coturnix c. coturnix) under conditions of food abundance. 9 pp. 

 Röhrer-Ertl O., 1982: Über Subspezies bei Pongo pygmaeus, Linnaeus, 1760. 5 pp. Spixiana 5(3): 317-321.

 Röhrer-Ertl O., 1983: Zur Erforschungsgeschichte und Namengebung beim Orang-Utan, Pongo satyrus (Linnaeus, 1758); Synon. Pongo pygmaeus (Hoppius, 1763). Mit Kurzbibliographie. 32 pp. Spixiana 6(3): 301-332.

 Röhrer-Ertl O., 1983: Zur Erforschungsgeschichte und Namengebung beim Orang-Utan, Pongo satyrus (Linnaeus, 1758); Synon. Pongo pygmaeus (Hoppius, 1763). Mit Kurzbibliographie. 32 pp. [81086] Spixiana 6(3): 301-332.

 Rojas M. de, Úbeda J. M., Guevara D. C., Ariza C., 1993: Estudio de cinco especies de ácaros plumícolas del género Proctophyllodes Robin, 1877 (Acarina, Proctophyllodidae) parásitas de aves paseriformes espanolas (2 fig.). [Study of five species of feather mites genus Proctophyllodes Robin, 1877 (Acarina, Proctophyllodidae) parasitic on Spanish paseriform birds.] 6 pp. Bol. R. Soc. Esp. Hist. Nat. (Sec. Biol.) 90(1-4): 55-60.

 Rolik H., 1960: Cobitis aurata (Fillipi, 1865) – koza zlotawa, nowy gatunek w zleciwsku Morga Baltyckiego. 20 pp. Fragmenta Faunistica 8/26: 411-420.

 Rolik H., 1962: Biometria oraz niektóre zagadnienia biologii I systematyki Leuciscus cephalus (L.) z rzeki San. 18 pp. Fragmenta Faunistica 9/23: 355-372.

 Rolik H., 1965: Materialy dotyczace zmiennosci geograficznej I ekologicznej Gobio gobio (L.) w Polsce. 15 pp. Fragmenta Faunistica 12/2: 15-29.

 Romankow-Zmudowska A., 1993: Summer high temperatures and abundance of the common vole, Microtus arvalis Pall. (Rodentia) in leguminous and see grass cultures in Poland. 3 pp. Przeglad Zool. 37(3-4): 307-309.

 Rosa G. M, Bergo P. E., Crottini A., Andreone F., 2012: Report of the life colouration of the enigmatic burrowing skink Voeltzkowia rubrocaudata (Grandidier, 1869) from southwestern Madagascar. 4 pp. (in English). Bonn zoological Bulletin 61(1): 31-34.