Ogata, K.; Touyama, Y.; Choi, B.-M. 1994. Ant fauna of Hiroshima Prefecture, Japan. [In Japanese.]. Ari 18:18-25.

Ohl, M. 2004. The first fossil representative of the wasp genus Dolichurus, with a review of fossil Ampulicidae (Hymenoptera: Apoidea). Journal of the Kansas Entomological Society 77:332-342. PDF

Ohnishi, H.; Imai, H. T.; Yamamoto, M.-T. 2004 ("2003"). Molecular phylogenetic analysis of ant subfamily relationship inferred from rDNA sequences. Genes and Genetic Systems 78:419-425. PDF

Ohta, Y. 1931a. The check-list of ants from Gifu Prefecture, 1. [In Japanese.]. Insect World 35:85-89.

Ohta, Y. 1931b. The check-list of ants from Gifu Prefecture, 2. [In Japanese.]. Insect World 35:115-120.

Ohta, Y. 1935a. A list of Japanese ants. [In Japanese.] [part]. Insect World 39:286-289. PDF

Ohta, Y. 1936a. A list of Japanese ants. [In Japanese.] [part]. Insect World 40:166-169. PDF

Ohta, Y. 1936b. A list of Japanese ants. [In Japanese.] [concl.]. Insect World 40:426-433. PDF

Ohta, Y. 1938a. Five species of ants from Kinkasan, Gifu. [part] [In Japanese.]. Insect World 42:125-129. PDF

Ohta, Y. 1938b. Five species of ants from Kinkasan, Gifu. [concl.] [In Japanese.]. Insect World 42:186-188. PDF

Ohta, Y. 1940. Two species of ants from South China. [In Japanese.]. Insect World 44:332-335. PDF

Okamoto, H. 1952. Ants from Shikoku, Japan (1). [In Japanese.]. Gensei 1:9-12.

Okamoto, H. 1953. Ants from Shikoku, Japan (2). [In Japanese.]. Gensei 2:39-43.

Okamoto, H. 1954. Ants from Shikoku, Japan (3). [In Japanese.]. Gensei 3:43-49.

Okamoto, H. 1957. Ants from Shikoku, Japan (4). [In Japanese.]. Gensei 5(2):39-43.

Okamoto, H. 1966. Ants from Shikoku, Japan (5). [In Japanese.]. Gensei 16:5-8.

Okamoto, H. 1969. Ants from Shikoku, Japan (6). [In Japanese.]. Gensei 19:5-10.

Okamoto, H. 1972a. Ants from Shikoku, Japan (7). [In Japanese.]. Gensei 23:11-14.

Okamoto, H. 1972b. The occurrence of Triglyphothrix striatidens (Emery) in Kyushu. [In Japanese.]. Gensei 23:14.

Okano, K. 1945. On the ants of Enoshima Is., Kanagawa Prefecture on the late spring. [In Japanese.]. Kontyû Kenkyu 2(4):19-20.

Notes: Not seen. Cited in Okano (1989) and Onoyama & Terayama (1994).

Okano, K. 1946. Some taxonomical notes on the group "Camponotus itoi". [In Japanese.]. Kagaku (Tokyo) 16:187-188.

Notes: Not seen. Cited in Okano (1989) and Onoyama & Terayama (1994).

Okano, K. 1947a. Some discussions on the classification of ants. [in Japanese.]. Igaku Seibutsugaku 11:164-167. PDF

Notes: Not seen. Cited in Okano (1989) and Onoyama & Terayama (1994).

Okano, K. 1947b. On the ant "suzukikuroyamaari" described by Mr. Teranishi. [In Japanese.]. Igaku Seibutsugaku 11:167-169. PDF

Notes: Not seen. Cited in Okano (1989) and Onoyama & Terayama (1994).

Okano, K. 1948. Delle note sulle formiche giapponesi. Kontyû Kagaku 5:91-93.

Notes: Not seen. Cited in Okano (1989) and Onoyama & Terayama (1994).

Okano, K. 1989. The list of works concerning Formicidae (Hymenoptera) and it's related papers made by the Japanese during the years 1900-1949. Entomo Shirogane 2:1-15.

Okido, H. 2002. Morphological and biogeographical notes of Myrmecina flava complex (Hymenoptera, Formicidae). [Abstract.]. P. 168 in: Billen, J. P. J. 2002. XIV International Congress of IUSSI. The Golden Jubilee Proceedings. 27 July - 3 August 2002, Hokkaido University, Sapporo, Japan. Sapporo: XIV International Congress of IUSSI, 233 pp.

Okido, H.; Ogata, K.; Hosoishi, S. 2020. Taxonomic revision of the ant genus Myrmecina in Southeast Asia (Hymenoptera: Formicidae). Bulletin of the Kyushu University Museum 17:1-108. PDF

Okita, I.; Murase, K.; Sato, T.; Kato, K.; Hosoda, A.; Terayama, M.; Masuko, K. 2013. The spatial distribution of mtDNA and phylogeographic analysis of the ant Cardiocondyla kagutsuchi (Hymenoptera: Formicidae) in Japan. Sociobiology 60:129-134. PDF

Oldham, N. J.; Morgan, E. D.; Gobin, B.; Billen, J. P. J. 1994. First identification of a trail pheromone of an army ant (Aenictus species). Experientia (Basel) 50:763-765. PDF

Oldham, N. J.; Morgan, E. D.; Gobin, B.; Schoeters, E.; Billen, J. P. J. 1994. Volatile secretions of Old World army ant Aenictus rotundatus and chemotaxonomic implications of army ant Dufour gland chemistry. Journal of Chemical Ecology 20:3297-3305.