Australian Longhorn Beetles (Coleoptera: Cerambycidae) Volume 3Longhorn beetles Cerambycidae are one of the most easily recognised groups of beetles, a cosmopolitan family that encompasses more than 33,000 species in 5,200 genera worldwide. Out of the 117 beetle families occurring in Australia, Cerambycidae is the sixth largest, comprising more than 1,400 species classified in 300 genera. Virtually all Cerambycidae feed on living or dead plant tissue and play a significant role in all terrestrial environments.