Petrognatha
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Family:	Cerambycidae
Tribe:	Petrognathini
Genus:	Petrognatha Fabricius, 1792
Species:	P. gigas
Binomial name
Petrognatha gigas (Fabricius, 1792)[1]

Petrognatha is a monotypic longhorn beetle genus belonging to the subfamily Lamiinae, tribe Petrognathini. 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 trees and the adults strongly resemble the bark. Furthermore, the antennae and legs resemble twigs when they are extended forward.