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''Omma'' is a genus of beetles in the family Ommatidae. ''Omma'' is an example of a living fossil. The oldest species known, ''O. liassicum'', lived during the final stage of the Triassic (Rhaetian), followed by several other species from Europe and Asia until after ''O. attenuatum'' from the Lower Cretaceous (lower Aptian), the genus disappears from the fossil record for the remaining 120 million years up until today, with 4 species endemic in Australia. == Species, temporal and spatial distribution == The following extinct and extant species have been described.〔(Ommatidae Species List ) at Joel Hallan’s Biology Catalog. Texas A&M University. Retrieved on 11 May 2012.〕 * ''Omma aberratum'' Ponomarenko, 1968, Late Jurassic (Oxfordian and Kimmeridgian) Karabastau Formation, Karatau, Kazakhstan * ''Omma altajense'' Ponomarenko, 1997, Middle to Later Jurassic, Togo-Khuduk sequence, Bakhar, Mongolia * ''Omma antennatum'' Ponomarenko, 1997, Lower Cretaceous, Khurilt sequence, Bon-Tsagan, Mongolia * ''Omma avus'' Ponomarenko, 1969, Lower Jurassic (Hettangian), Dgil’skaya Formation, Issyk-Kul’, Kyrgyzstan * ''Omma brevipes'' Deichmueller, 1886, Upper Jurassic (Tithonian), Solnhofener Formation, Solnhofen, Germany * ''Omma delicata'' Tan, Wang, Ren & Yang, 2012, Middle Jurassic (Bathonian-Callovian boundary), Jiulongshan Formation, Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China * ''Omma gobiense'' Ponomarenko, 1997, Lower Cretaceous (Campanian), Ulan-Ereg Formation, Khoutiin-Khotgor, Mongolia * ''Omma jurassicum'' Ponomarenko, 1968, Late Jurassic (Oxfordian and Kimmeridgian) Karabastau Formation, Karatau, Kazakhstan * ''Omma liassicum'' Crowson, 1962, Late Triassic (Rhaetian), Brown’s wood, Warwickshire, England * ''Omma mastersi'' MacLeay, 1871, recent, Australia * ''Omma pilosum'' (Ponomarenko, 1964) = ''Ommamima pilosum'', Late Jurassic (Oxfordian and Kimmeridgian) Karabastau Formation, Karatau, Kazakhstan * ''Omma rutherfordi'' Lawrence, 1999, recent, Australia * ''Omma sagitta'' Neboiss, 1989, recent, Australia * ''Omma sibiricum'' Ponomarenko, 1966, Lower Cretaceous (Valanginian), Zazinskaya Formation, Baissa, West Transbaikalia Russia * ''Omma stanleyi'' Newman, 1839 (type), recent, Australia * ''Omma zitteli'' (Oppenheim, 1888) = ''Procarabus zitteli'', Upper Jurassic (Tithonian), Solnhofener Formation, Solnhofen, Germany 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Omma」の詳細全文を読む スポンサード リンク
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