Promecognathus crassus

Promecognathus crassus is a species of ground beetle in the family Carabidae. It is found along the Pacific coast of North America, from British Columbia to California.^[1]

Promecognathus crassus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Adephaga
Family:	Carabidae
Genus:	Promecognathus
Species:	P. crassus
Binomial name
Promecognathus crassus LeConte, 1868
Synonyms[1]
Promecognathus contractus, Promecognathus corpulentus, Promecognathus grandiceps

P. crassus, like its close relative Promecognathus laevissimus, uses its large jaws to feed on millipedes, including those that produce hydrogen cyanide and benzaldehyde, like Xystocheir dissecta. It displays a high tolerance to these toxins.^[2]