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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Connor, J.P., Winter, T.G. & Good, G.A. | 1991 | A review of the Irish Scolytidae (Insecta: Coleoptera) | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P., Wistow, S., Ashe, P. & O'Connor, M.A. | 1998 | A review of the Irish gall-inducing Cecidomyiidae (Diptera) and their inquilines | Journal | Ir. Nat. J. | Details... |
| O'Connor, M. | 1927 | Tree-wasps' nest inhabited by spider | Journal | Ir. Nat. J. | Details... |
| O'Donovan, J.E. | 1953 | Mecostethus grossus in West Cork | Journal | Ir. Nat. J. | Details... |
| O'Farrell, A.F. | 1943 | The striped hawk-moth, Celerio lineata livornica Esp., in County Down | Journal | Ir. Nat. J. | Details... |
| O'Farrell, A.F. | 1947 | Lepidoptera in Northern Ireland, 1943-5 | Journal | Ir. Nat. J. | Details... |
| O'Flynn, H. | 1931 | Further Irish records for convolvulus hawk moth, 1930 | Journal | Ir. Nat. J. | Details... |
| O'Gorman, F. | 1965 | Argas vespertilionis (Latreille), a tick previously unrecorded in Ireland | Journal | Ir. Nat. J. | Details... |
| O'Gorman, F. | 1965 | Siphonaptera new to Co. Kilkenny | Journal | Ir. Nat. J. | Details... |
| O'Gorman, F. | 1965 | Iscnopsyllus octactenus (Kolenati) (Siphonaptera: Ischnopsyllidae) a bat flea from Mid County Cork | Journal | Ir. Nat. J. | Details... |
| O'Gorman, F. & Claassens, A.J.M. | 1965 | The second record of Iscnopsyllus (Ischnopsyllus) simplex simplex Rothschild 1906 (Siphonaptera) in Ireland | Journal | Ir. Nat. J. | Details... |
| O'Grady, M. | 1931 | Further Irish records for convolvulus hawk moth, 1930 | Journal | Ir. Nat. J. | Details... |
| O'Kennedy, N.D. | 1962 | Some major pests and diseases of apples | Book | | Details... |
| O'Mahony, E. | 1924 | Dublin insects | Journal | Ir. Nat. | Details... |
| O'Mahony, E. | 1924 | Records for Choleva nigrita, Cassida nobilis and other beetles in Co. Dublin | Journal | Ir. Nat. | Details... |
| O'Mahony, E. | 1924 | Athous difformis Lac. and other beetles in Co. Dublin | Journal | Ir. Nat. | Details... |
| O'Mahony, E. | 1925 | The fauna of a tank | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1927 | A new locality, in Co. Dublin, for Brychius elevatus | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1927 | Three beetles new to the Irish fauna | Journal | Ent. Monthly Mag. | Details... |
| O'Mahony, E. | 1927 | A new Irish beetle, Ocyusa picina Aub. | Journal | Ent. Monthly Mag. | Details... |
4097 references found.