Ground Beetle - Evolution and Systematics

Evolution and Systematics

The Adephaga are documented since the end of the Permian, about 250 million years ago. Ground beetles evolved in the latter Triassic, having separated from their closest relatives by 200 million years ago. The family diversified throughout the Jurassic, and the more advanced lineages, such as the Harpalinae, underwent a vigorous radiation starting in the Cretaceous. The closest living relatives of the ground beetles are the false ground beetles (Trachypachidae) and the wrinkled bark beetles (Rhysodidae). They are sometimes even included in the Carabidae as subfamilies or as tribes incertae sedis, but more preferably they are united with the ground beetles in the superfamily Caraboidea.

Much research has been done on elucidating the phylogeny of the ground beetles and adjusting systematics and taxonomy accordingly. While there is no completely firm consensus, a few points are generally accepted: As it seems, the ground beetles consist of a number of more basal lineages and the extremely diverse Harpalinae which contain over half the described species and into which several formerly independent families had to be subsumed.