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 Okada H., Nakasuji F., 1993: Patterns of local distribution and coexistence of two giant water bugs, Diplonychus japonicus and D. major (Hemiptera, Belostomatidae) in Okayama, western Japan. 6 pp. 

 Okada I., 1938: Einige fungivoriden vom Daisetsu-Gebirge in Hokkaido (Dipt., Nematocera). 8 pp. 

 Okada K., 2005: Occurrence of the genus Colobicones Grouvelle (Coleoptera, Zopheridae, Colydiinae) in Japan, with descriptions of two new species. 7 pp. Elytra 33(2): 425-431.

 Okada T., 1973: Drosophilidae and Diastatidae from Mongolia (Diptera). 9 pp. 

 Okada T., 1974: Drosophilidae (Diptera) from Korea. 7 pp. Ann. Hist.-nat. Mus. Nat. Hung. 66: 269-275.

 Okada T., 1975: The oriental Drosophilids breeding in flowers. 8 pp. Kontyu, Tokyo 43(3): 356-363.

 Okada T., 1978: Pseudostegana, a new subgenus of the genus Stegana Meigen (Diptera, Drosophilidae. 8 pp. Kontyu, Tokyo 46(3): 392-399.

 Okada T., 1980: A revision of the genera Hypselothyrea de Meijere and Tambourella Wheeler (Diptera, Drosophilidae). 16 pp. Kontyu, Tokyo 48(4): 501-516.

 Okada T., 1980: Synhospitalic evolution of the genus Drosophilella Duda (Diptera, Drosophilidae), with description of a new species from Okinawa and Taiwan. 8 pp. Kontyu, Tokyo 48(2): 218-225.

 Okada T., 1992: New or Little Known Species of the Genera Liodrosophila Duda and Sphaerogastrella Duda (Diptera, Drosophilidae) from Papua New Guinea and S. E. Asia. 12 pp. 

 Okada T., Nishiharu S., 1981: A new species of the subgenus Scaptodrosophila of the genus Drosophila (Diptera, Drosophilidae) visiting flowers in Japan. 4 pp. Kontyu, Tokyo 49(3): 422-425.

 Okada Y., 1950: Notes on the generic name of so called Euchloe-species from Japan (Pieridae). 8 pp. 

 Okada Y., 1951: Butterflies and Moths. Genus Lamproptera Gray. 8 pp. The Transactions of the Lepidopterological Society of Japan

 Okajima S., 1975: Notes on the Thysanoptera from the Ryukyu Islands. I. Descriptions of two new species. 7 pp. Kontyu, Tokyo 43(1): 13-19.

 Okajima S., 1976: Descriptions of four new species of the Idiothrips complex (Thysanoptera, Phlaeothripidae). 13 pp. Kontyu, Tokyo 44(1): 13-25.

 Okajima S., 1976: Notes on the genus Stephanothrips Trybom (Thysanoptera, Phlaeothripidae) from Japan and Taiwan. 8 pp. Kontyu, Tokyo 44(4): 403-410.

 Okajima S., 1976: Notes on the Thysanoptera from the Ryukyu Islands. II. On the genus Stigmothrips Ananthakrishnan. 11 pp. Kontyu, Tokyo 44(2): 119-129.

 Okajima S., 1977: Description of a new species of the genus Hyidiothrips Hood (Thysanoptera, Phlaeothripidae) from Japan. 5 pp. Kontyu, Tokyo 45(2): 214-218.

 Okajima S., 1978: Notes on the Thysanoptera from Southeast Asia II. A new species of the genus Veerabahuthrips (Phlaeothripidae). 4 pp. Kontyu, Tokyo 46(2): 165-168.

 Okajima S., 1978: Notes on the Thysanoptera from southeast Asia IV. A new genus and two new species of the tribe Hydiothripini (Phlaeothripidae). 10 pp. Kontyu, Tokyo 46(4): 539-548.

 Okajima S., 1978: Notes on the Thysanoptera from Southern Asia I. On the genus Podothrips Hood (Phlaeothripidae). 9 pp. Kontyu, Tokyo 46(1): 29-37.

 Okajima S., 1978: Notes on the Thysanoptera from the Southeast Asia III. Two new species of the genus Azaleothrips Ananthakrishnan (Phlaeothripidae). 7 pp. Kontyu, Tokyo 46(3): 385-391.

 Okajima S., 1979: A revisional study of the genus Apelaunothrips (Thysanoptera: Phlaeothripidae). 26 pp. Systematic Entomology 4(1): 39-64.

 Okajima S., 1979: Notes on the Thysanoptera from the southeast Asia V. A new species of the genus Franklinothrips Back (Aeolothripidae). 3 pp. Kontyu, Tokyo 47(3): 399-401.

 Okajima S., 1979: Two new species of the genus Gastrothrips Hood (Thysanoptera: Phlaeothripidae) from Japan and Taiwan. 6 pp. Kontyu, Tokyo 47(4): 511-516.

 Okajima S., 1981: A revision of the tribe Plectrothripini of fungus-feeding Thysanoptera (Phlaeothripidae: Phlaeothripinae). 46 pp. Systematic Entomology 6(3): 291-336.

 Okajima S., 1999: On four Dichromothrips species (Thysanoptera, Thripidae) collected from one population of Arundina sp. (Orchidaceae) in Sabah, Borneo. 8 pp. Japanese Journal of systematic Entomology (N.S.) 5(1): 145-152.

 Okajima S., Urushihara H., 1995: Descriptions of four new Urothripine species (Thysanoptera, Phlaeothripidae) from southeast Asia. 8 pp. Japanese Journal of systematic Entomology (N.S.) 1(1): 27-34.

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 Okáli I., 1983: Činnosť Slovenskej entomologickej spoločnosti pri SAV v rokoch 1977 až 1982. 12 pp. 

 Okáli I., 1986: List of the type specimens in the collections of the Slovak national museum – institute of natural history, Bratislava: Insecta, Diptera. 2 pp. 

 Okáli I., Labuda M., 1986: History of the research of malaria in Slovakia. 3 pp. (in Slovakian). 

 Okamoto C., Tsuda K., Yamaguchi D., Sato S., Pemberton R. W., Yukawa J., 2008: Life history and host specificity of the Japanese flea beetles Trachyaphthona sordida and T. nigrita (Coleoptera: Chrysomelidae), potential biological control agents against skunk vine, Paederia foetida (Rubiaceae), in the southeastern parts of the United States and Hawaii. 10 pp. Entomological Science 11(2): 143-152.

 Okamoto M., 2011: Observations of the mating system of Cissites cephalotes (Coleoptera: Meloidae), with notes on its life history. 13 pp. Japanese Journal of Entomology (N. S.) 14(4): 263-275.

 Okamoto T., Macgowan I., Su Z. H., 2012: Predation on the pollinating fig wasp of Ficus erecta by larvae of Silba sp. (Diptera: Lonchaeidae). 6 pp. Entomological Science 15(3): 288-293.

 Okaue M., Yamamoto K., Touyama Y., Kameyama T., Terayama M., Sugiyama T., Murakami K., Ito F., 2007: Distribution of the Argentine ant, Linepithema humile, along the Seto Inland Sea, western Japan: Result of surveys in 2003-2005. 6 pp. Entomological Science 10(4): 337-342.

 Okazawa T., 1975: Aquatic insect survey of the river Kaunnai, with special reference to the Rockey Chute Bed fauna. 16 pp. Kontyu, Tokyo 43(4): 497-512.

 Okazawa T., Miyagi I., Yong H. S., 1992: Oviposition and Eggs of Armigeres (Leicesteria) flavus (Diptera, Culicidae). 5 pp. 

 Okazi I., Labuda M., 1988: Dejiny výskumu malárie na Slovensku. 18 pp. 

 Okely E. F., 1974: Description of the puparia of twenty-three British species of Sphaeroceridae (Diptera, Acalyptratae). 16 pp. 

 Okland F., 1932: Norske „halvinsekter“ (Protura). 7 pp. 

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

 Okolów C., 1963: Materialy do fauny zerowisk korników – Scolytidae Puszczy Boreckiej. 7 pp.