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 Prokop R. J., Petr V., 1987: Marhoumacrinus legrandi, gen. et sp. n. (Crinoidea, Camerata) from Upper Silurian – lowermost Devonian of Algeria. 22 pp. Acta Musei Nationalis Pragae 43B(1): 1-22.

 Prokop R. J., Petr V., 1997: The genus Pygmaeocrinus Bouška, 1947 (Crinoidea, Inadunata) in the Devonian of the Barrandian Area (Czech Republic). 18 pp. Acta Musei Nationalis Pragae 53B(1-2): 1-18.

 Prokopič J., Bílý S., 1975: Beetles (Coleoptera) as new intermediate hosts of helminths. 7 pp. Věstník Československé spol. zoologické (Praha) 39: 224-230.

 Prokopič J., Křivanec K., 1975: Helminths of amphibians, their interaction and host-parasite relationships. 5 pl., 48 pp. Acta Scientiarum Naturalium Academiae Scientiarium Bohemoslovacae Brno (N.S.) 9(3): 1-48.

 Pronzato R., Manconi R., 2001: Atlas of European freshwater sponges. 62 pp. Ann. Mus. civ. St. nat. Ferrara 4: 3-64.

 Prpic N.-M., 2001: A new species of Loxosoma from north-western Finistére, France (Spiralia, Kamptozoa (= Entoprocta), Solitaria, Loxosomatidae). 6 pp. Spixiana 24(2): 97-102.

 Prunesco C., 1965: Contributions a la connaissance du groupe d’especes Lithobius (Monotarsobius) microps Meinert, L. (M.) burzenlandicus (Verhoeff) et L. (M.) sciticus n. sp. (Chilopoda, Lithobiomorpha). 9 pp. Acta zoologica cracoviensia 10/6: 506-513.

 Prunesco C., 1966: Groupe des espéces Lithobius punctulatus C. Koch – Lithobius matici nom. nov. (Chilopoda) en Europe. 17 pp. Acta zoologica cracoviensia 11/3: 51-62.

 Prunescu-Arion E., 1968: Contributions to the study of bentonic fauna of certain rivers of the zone of the future Portile de Fier dam lake.19 pp. 

 Puylaert F., 1977: Vermes: Nématodes parasites de Vertébrés. Pp. 515-518. In: La faune terrestre de l’ile de Sainte-Helene. Quatriéme partie. 4 pp. Ann. Mus. Roy. Afr. Centr. Zool. 220: 1-575.

 Rafalski J., 1977: Materialy do fauny Pauropoda Polski, I. Rozdaj Brachypauropus Latzel, 1884. 10 pp. 

 Rafalski J., 1977: Materialy do fauny Pauropoda Polski, I. Rozdaj Brachypauropus Latzel, 1884. 10 pp. [EVE 602] Annales Zoologici 33/19: 435-444

 Rafalski J., 1990: Acopauropus szeptyckii sp. n. (Pauropoda, Eurypauropodidae) from North Korea. 7 pp. 

 Rafalski J., 1990: Acopauropus szeptyckii sp. n. (Pauropoda, Eurypauropodidae) from North Korea. 7 pp. [EVE 603] Acta zoologica cracoviensia 33/24: 513-519.

 Rahayu D. L., Ng. P. K. L., 2005: On two new species of the genera Haberma and Parasesarma (Crustacea: Decapoda: Brachyura: Sesarmidae). 12 pp. Zoologische Mededelingen Leiden 79 (2): 167-178.

 Raineri M., 1998: Proposta di una nuova classificazione di Tunicati i Cefalocordati come Gastroneuralia. Implicazioni filogenetiche e cenni storici sulle origini del concetto di Procordati. 83 pp. 

 Rakhmanov R. R., 1971: Rasprostranenie i ekologija Amblyiulus continentalis (Diplopoda, Julidae) v Lenkoranskom zone Azerbajdzhana. 2 pp. 

 Ramil F., Parapar J., Vervoort W., 1992: The genus Sertularella Gray, 1848 (Cnidaria: Hydroida) along the coasts of Galicia (Spain). 32 pp. 

 Ramil F., Vervoort W., 1992: Pseudoplumaria gen. nov. a new Atlantic genus of the family Plumulariidae (Cnidaria: Hydrozoa). 8 pp. 

 Ramil F., Vervoort W., 1992: Pseudoplumaria gen. nov. a new Atlantic genus of the family Plumulariidae (Cnidaria: Hydrozoa). 8 pp. [EVE 605] Zoologische Mededelingen 66(36): 485-492.

 Ramil F., Vervoort W., 2004: Note on Aglaophenopsis cartieri (Bedot, 1921) (Cnidaria: Leptolida: Aglaopheniidae) and discussion of its taxonomic position. 8 pp. Zoologische Mededelingen Leiden 78: 257-264.

 Ramil F., Vervoort W., 2008: Note on Streptocaulus multiseptatus (Bale, 1915) (Cnidaria: Leptolida: Aglaopheniidae), with the description of its gonosome. 6 pp. Zoologische Mededelingen 82: 417-422.

 Ramil F., Vervoort W., Ansín J. A., 1998: Report on the Haleciida and Plumularioidea (Cnidaria, Hydrozoa) cellected by the French SEAMOUNT 1 Expedition. 42 pp. Zoologische Verhandelingen.

 Raso J. E. G., 1984: Brachyura of the coast of Southern Spain (Crustacea, Decapoda). 9 pp. Spixiana 7: 105-113.

 Read H. J., 1989: New species and records of the Cylindroiulus madeirae-group, with notes on phylogenetic relationships (Diplopoda, Julida: Julidae). 15 pp. 

 Read H. J., 1989: The Cylindroiulus perforatus-group, with the description of a new species and notes on variation within C. perforatus Verhoeff, 1905 (Diplopoda, Julida: Julidae). 7 pp. 

 Read H. J., 1990: The generic composition and relationships of the Cylindroiulini – a cladistic analysis (Diplopoda, Julida: Julidae). 16 pp. 

 Rego A. A., 1995: A new classification of the cestode order Proteocephalidea Mola. 24 pp. Revta bras. Zool. 12(4): 791-814.

 Rego A. A., Pavanelli G. C., 1992: Redescricao de Nomimoscolex admonticellia (Woodland), comb. n. (Cestoda: Proteocephalidea), parasito de Pinirampus pirinampu (Spix), um siluriforme de água doce. 7 pp. Revta bras. Zool. 9(3-4): 283-289.

 Řeháček J., 1989: Některé méně známe mikroorganizmy u klíšťat na Slovensku. 6 pp. Entomological Problems 19: 281-286.

 Řeháček J., 1989: Zmiešané infekcie mikroorganizmov u kliešťov [Multiple microbial infections in ticks] (in Slovak). 8 pp. Entomological Problems 19: 33-40.

 Řeháček J., Kocianová E., 1989: Sledovanie premorenia vybraných lokalít Záhorskej nížiny na povodcu Q horúčky, Coxiella burnetii. 6 pp. Entomological Problems 19: 365-370.

 Rehfous M. M., 1933: Note sur Xanthospilapteryx loriolella Frey. 3 pp. (in French). Bul. Soc. Lépid. Geneve 7: 61-63.

 Reichholf J. H., Steinbach G., (eds.), 2002: Ptáci. 160 pp.   Discount 20%!

 Reichholf J., 1981: Some data on a sample of the sanddollar Encope emarginata (Leske, 1778) from the Coast of Santa Catarina, Brazil. 4 pp. Spixiana 4(1): 111-114.

 Reichholf J., 1981: Some data on a sample of the sanddollar Encope emarginata (Leske, 1778) from the Coast of Santa Catarina, Brazil. 4 pp. [EVE954] Spixiana 4(1): 111-114.

 Reichholf J., 1983: Ökologie und Verhalten des Muschelkrebses Heterocypris incongruens Claus, 1892 (Ostracoda). 6 pp. Spixiana 6(2): 205-210.

 Reid J. W., 1998: Redescription and first records from Brazil of Diacyclops uruguayensis Kiefer (Crustacea, Copepoda, Cyclopidae). 10 pp. Revta bras. Zool. 15(3): 757-766.

 Rein S., 2003: Zur Biologie der Ceratiten der spinosus-Zone – Ergebnisse einer Populationsanalyse; Teil I: Populationsstatistik, Sexual-Dimorphismus und Artkonzept. 22 pp. [81083] Veröffentlichungen des Naturkundemuseum Erfurt 22: 29-50.

 Rein S., 2007: Die Biologie der Ceratiten der flexuosus-, sequens/pulcher- und semipartitus/meissnerianus-Zone-Entstehung und Aussterben der Biospezies Ceratites nodosus. 29 pp. (in German). Veröffentlichungen des Naturkundemuseum Erfurt 26: 39-67.

 Rein S., 2010: Die Stellung der Chronospezies Ceratites evolutus in der Ceratitenphylogenese – Ergebnisse einer Populationsanalyse. 19 pp. Vernate 29: 5-23.

 Reinhard E. G., 1958: Rhizocephala of the family Peltogastridae parasitic on West Indian species of Galatheidae. 12 pp. 

 Reiss F., 1973: Zur Hydrographie und Makrobenthosfauna tropischer Lagunen in den Savannen des Territórie de Roraima, Nordbrasilien. 12 pp. Amazoniana 4(4): 367-378.

 Reiss F., 1976: Charakterisierung zentralamazonischer Seen aufgrund ihrer Makrobenthosfauna. 12 pp. Amazoniana 6(1): 123-134.

 Reiss F., 1977: Qualitative and quantitative investigations on the macrobenthic fauna of Central Amazon lakes. I. Lago Tupé, a black water lake on the lower Rio Negro. 33 pp. Amazoniana 6(2): 203-235.

 Reitner J., Mehl D., 1996: Monophyly of the Porifera. 28 pp. [80578] Verhandlungen des Naturwissenschaftlichen Vereins in Hamburg 36: 5-32.

 Repetto G., 2013: Ritrovamenti di piastre di Scalpellum magnum Darwin, 1851 (Crustacea: Cirripedia: Thoracica) nel Pliocene del Piemonte (Italia NO). Findings of some plates of Scalpellum magnum Darwin, 1851 (Crustacea: Cirripedia: Thoracica) in the Pliocene Piedmont (NW Italy). 8 pp. Rivista Piemontese di Storia Naturale 34: 81-88.

 Reshetnjak V. V., 1953: Novye vidy radioljarij Ochotskogo morja.  

 Restivo de Miranda M. A., 1976: Descrizione di Monotarsobius grafittii n. sp., della Sardegna (Chilopoda). 4 pp. Bolletino della Societa Entomologica Italiana 108(8-10): 180-183.