''Petrognatha'' is a monotypic longhorn beetle genus belonging to the subfamily Lamiinae, tribe

Petrognathini Petrognathini is a tribe of longhorn beetles of the subfamily Lamiinae Lamiinae, commonly called flat-faced longhorns, are a subfamily of the longhorn beetle family (Cerambycidae). The subfamily includes over 750 genera, rivaled in diversity w ...

. It was described by Johan Christian Fabricius in 1792. Its only species, ''Petrognatha gigas'', the giant African longhorn beetle, described in the same year by Fabricius, is found in Central Africa. The larvae bore into the wood of fallen ''

Acacia ''Acacia'', commonly known as the wattles or acacias, is a large genus of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa and Australasia. The genus na ...

'' trees and the adults strongly resemble the bark. Furthermore, the antennae and legs resemble twigs when they are extended forward.

References

Petrognathini Beetles of Africa Monotypic Cerambycidae genera {{Lamiinae-stub