Oatman E. R., 1985: Aphanogmus floridanus, a primary parasite of Feltiella acarivora, a predator of spider mites on strawberry (Hymenoptera: Ceraphronidae; Diptera: Cecidomyiidae). 3 pp. Proc. Entomol. Soc. Wash. 87(4): 714-716.

 Obata I., Futakami M., Suzuki T., 1991: Eubostrychoceras densicostatum Matsumoto, a large Heteromorph ammonite species, from the Upper Cretaceous of Wakkanai in Hokkaido. 7 pp. Memoirs of the National Science Museum 24: 27-33.

 Obrtel R., 1976: Soil surface harvestmen (Opilionidea) in a lowland forest. 34 pp. [M34] Acta Scientiarum Naturalium Academiae Scientiarium Bohemoslovacae Brno (N.S.) 10(12): 1-34.

 Ocana A., Brito A., Nunez J., 1992: A new species of Sarcodictyon (Anthozoa: Stolonifera) from Tenerife, Canry Islands. 6 pp. 

 Ocana A., Brito A., Nunez J., 1992: A new species of Sarcodictyon (Anthozoa: Stolonifera) from Tenerife, Canry Islands. 6 pp. [EVE 543] Zoologische Mededelingen 66(31): 423-428.

 Ocana A., Hernández J. A., Monterrubio E., 1999: Description of Achromadora gracilis n. sp. and observations on A. micoletzkyi (Stefanski, 1915) Van der Linde, 1938 and Ethmolaimus multipapillatus Paramonov, 1926 (Nematoda: Chromadorida) from Spanish lakes. 12 pp. 

 Ocana A., Hernández J. A., Monterrubio E., 1999: Description of Achromadora gracilis n. sp. and observations on A. micoletzkyi (Stefanski, 1915) Van der Linde, 1938 and Ethmolaimus multipapillatus Paramonov, 1926 (Nematoda: Chromadorida) from Spanish lakes. 12 pp. [EVE 544] Zoologica Baetica 10: 3-14.

 Ocana A., Sanchéz Tocino L., 2005: Spawning of Holothuria tubulosa (Holothurioidea, Echinodermata) in the Alboran sea (Mediterranean Sea). 4 pp. Zoologica Baetica 16: 147-150.

 Ocana A., Sanchéz Tocino L., San Martín G., 2005: Description of egg masses of three species of sedentary polychaetes of the Mediterranean sea. 5 pp. Zoologica Baetica 16: 165-169.

 Ocana A., Tocino L. S., López-Gonzáles P. J., 2001: Faunistic and biogeographical observations concerning the Anthozoa (Cnidaria: Anthozoa) of the Granada coast (Sea of Alboran). 9 pp. [EVE 545] [80114] Zoologica Baetica 11(2000): 51-65.

 Odier F., Vago C., Lamy M. E., 1974: Persistence of virus of vertebrates in the hemocoel of insects: Study on the Poliovirus into the larvae of Coleoptera. 7 pp. (in French). [EVE 948] [COL 1664]  Annales de la Societe entomologique de France (N.S.) 10(2): 449-455.

 Oezkan M., 1985: Hydrobaderia n. Gen., eine neue Hydryphatide-Gattung aus der Türkei (Acari, Actinedida, Hydrachnellae). 8 pp. [M17] 

 Oezkan, 1982: Wassermilben (Acari, Actinedida) aus der Türkei. 32 pp. [M16] 

 Ofwegen L. P. van, 1989: On Wrightella coccinea (Ellis & Solander, 1786) and Wrightella stiasnyi spec. nov. (Anthozoa: Gorgonacea: Melithaeidae). 8 pp. Zoologische Mededelingen Leiden 63(3): 27-34.

 Ofwegen L. P. van, 1990: Notes on the Keroeididae (Anthozoa: Gorgonacea) collected in 1963 and 1964 by the international Indian ocean expedition of the r/v “Anton Bruun”, in the Indian ocean, with the description of a new species, Lignella hartogi. 6 pp. Zoologische Mededelingen Leiden 63(13): 163-168.

 Ofwegen L. P. van, 2005: A new genus of nephtheid soft corals (Octocorallia: Alcyonacea: Nephtheidae) from the Indo-Pacific. 236 pp. Zoologische Mededelingen Leiden 79(4): 1-236.

 Ofwegen L. P. van, 2008: The genus Sinularia (Octocorallia: Alcyonacea) at Palau, Micronesia. 105 pp. Zoologische Mededelingen 82: 631-735.

 Ofwegen L. P. van, 2008: The genus Sinularia (Octocorallia: Alcyonacea) from Bremer and West Woody islands (Gulf of Carpentaria, Australia). 35 pp. Zoologische Mededelingen 82: 131-165.

 Ofwegen L. P. van, Alderslade P., 2007: A new species of Alertigorgia (Coelenterata: Octocorallia: Anthothelidae) from the Indo Malayan region. 8 pp. Zoologische Mededelingen Leiden 81: 241-249.

 Ofwegen L. P. van, Benayahu Y., 1992: Notes on Alcyonacea (Octocorallia) from Tanzania. 16 pp. 

 Ofwegen L. P. van, Benayahu Y., 1992: Notes on Alcyonacea (Octocorallia) from Tanzania. 16 pp. [EVE 546] Zoologische Mededelingen 66(6): 139-154.

 Ofwegen L. P. van, Hermanlimianto M. I. Y. T., 2014: Siboga plexaurids (Coelenterata: Octocorallia) re-examined. 40 pp. Zoologische Mededelingen 88(1-4): 19-58.

 Ofwegen L. P. van, Vennam J., 1991: Notes on Octocorallia from the Laccadives (SW India). 12 pp. 

 Ofwegen L. P. van, Vennam J., 1991: Notes on Octocorallia from the Laccadives (SW India). 12 pp. [EVE 547] Zoologische Mededelingen 65(9): 143-154.

 Ofwegen L. P. van, Vennam J., 1994: Results of the Rumphius biohistorical expedition to Ambon (1990). Part 3. The Alcyoniidae (Octocorallia: Alcyonacea). 24 pp. 

 Ogandžanjan A. M., 1959: Biologija Hyalomma asiaticum caucasicum B. Pom. v uslovijach Armjanskoj SSR. 46 pp. 

 Okabe K., 2013: Ecological characteristics of insects that affect symbiotic relationships with mites. 16 pp. Entomological Science 16(4): 363-378.

 Okland J., 1964: Om utbredelsen av vannskorpionen (Nepy cinerea L.) i Norge. 7 pp. 

 Oliveira P. S., : Ant-mimicry in some spiders from Brazil. 15 pp. 

 Olivier P. A. S., Theron P. D., 1998: The genus Eupodes Koch (Acari: Prostigmata: Eupodidae) from southern Africa with a redescription of E. parafusifer Meyer & Ryke and descriptions of two new species. 14 pp. African Entomology 6(2): 275-288.

 Olszanowski Z., 1991: New mites of Holonothrus from Tasmania (Oribatida: Crotoniidae). 12 pp. [ARA 350] [M25] Genus.

 Olszanowski Z., 1994: A new species of Camisia von Heyden from Poland (Acari: Oribatida: Camisiidae). 6 pp. [ARA351] Genus 5(3): 209-214.

 Olszanowski Z., 1996: A monograph of the Nothridae and Camisiidae of Poland (Acari: Oribatida: Crotonoidea). 201 pp. Genus.

 Olszanowski Z., 1997: New oribatid species of the genus Crotonia from Brazil (Acari): Crotonidae). 7 pp. [ARA1698] Genus 8(3-4): 719-725.

 Olszanowski Z., 1997: Trimalaconothrus rafalskii n. sp. – a new oribatid mite species from Poland (Acari: Oribatida: Malaconothridae). 1 pp. [ARA1699] Genus 8(1): 103-108.

 Olszanowski Z., Bromberek K., 2011: Novonothrus lucasi spec. nov., a new moss mite from Australia (Acari: Oribatida: Nothridae). 9 pp. Genus 22(4): 667-675.

 Olszanowski Z., Szywilewska A., Norton R. A., 2001: New moss mite of the Camisia from western Nearctic region (Acari: Oribatida: Camisiidae). 12 pp. (in English). [ARA 1890] [M25] [M26] Genus 12(3): 395-406.

 Olszanowski Z., Szywilewska-Szczykutowicz A., Blaszak C., Ehrnsberger R., 2007: Die Milben in der Zoologischen Staatssammlung München. Teil 10. Überfamilie Crotonioidea (I) (Acari, Oribatida). 9 pp. Spixiana 30(2): 159-167.

 Omoloye A. A., 2010: Effects of genotype variation in the cultivated rice species on the biology and galling characteristics of the African rice gall midge, Orseolia oryzivora (Diptera: Cecidomyiidae). 8 pp. Entomological Science 13(3): 320-327.

 Omori M., Vervoort W., 1986: Observations on a living specimen of the giant hydroid branchiocerianthus imperator. 5 pp. Zoologische Mededelingen 60(16): 257-261.

 Ono H., 1986: Spiders of the families Clubionidae, Gnaphosidae and Thomisidae from the Noto Peninsula and the southern part of Ishikawa Prefecture, Japan. 8 pp. Memoirs of the National Science Museum 19: 167-174.

 Ono H., 1993: Spiders of the genus Clubiona (Araneae, Clubionidae) from Eastern Hokkaido, Japan. 6 pp. Memoirs of the National Science Museum 26: 89-94.

 Ono H., 2001: Crab spiders of the family Thomisidae from the Kingdom of Bhutan (Arachnida, Araneae). 34 pp. Entomologica Basiliensia 23: 203-236.

 Ono H., Hishikawa Y., 1989: Taxonomic revision of the Heptathelid spiders (Araneae, Mesothelae) from Amami-Ôshima Island, the Ryukyus. 7 pp. (in Japanese). Memoirs of the National Science Museum 22: 119-125.

 Ono H., Jocqué R., 1986: Two new species of the family Zodariidae from Saudi Arabia (Arachnida: Araneae). 6 pp. [ARA1700] Fauna of Saudi Arabia 8: 6-11.

 Ono H., Shinkai E., 1988: Notes on the Japanese sandy-beach spider, Lycosa ishikariana (Araneae, Lycosidae), based upon fresh topotypical speciemens. 5 pp. Memoirs of the National Science Museum 21: 131-135.

 Ono H., Tanikawa A., 1990: A revision of the Japanese spiders of the genus Langbiana (Araneae, Zodariidae). 12 pp. Memoirs of the National Science Museum 23: 101-112.

 Oplotna H., Rajski A., 1983: Oppiella rafalskii sp. n. (Acarida, Oribatida). 19 pp. [M18] [M54] Acta zoologica cracoviensia 26/16: 543-562.

 Opravilová V., Vaňhara J., Sukop I., 1999: Aquatic invertebrates of the Pálava Biosphere Reserve of UNESCO. 279 pp.  Discount 20%!

 Opresko D. M., 2001: Revision of the Antipatharia (Cnidaria: Anthozoa). Part I. Establishment of a new family, Myriopathidae. 28 pp. Zoologische Mededelingen Leiden 75(17): 343-370.