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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 until today, with four species endemic in Australia.