Insecta - Orthoptera - Geraridae

Full reference: S. H. Scudder. 1885. Palaeodictyoptera; or the affinities and classification of Paleozoic Hexapoda. Memoirs of the Boston Society of Natural History 3(11):319-351

Belongs to Gerarus according to L. Burnham 1983

Sister taxa: Gerarus bruesi, Gerarus collaris, Gerarus constrictus, Gerarus fischeri, Gerarus mazonus, Gerarus teutonicus

Type specimen: USNM 38136, an exoskeleton. Its type locality is Mazon Creek, USNM Lacoe Collection, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois.

Ecology:

Average measurements (in mm): body 71.0 x 10.0, wing 52.0 x 19.0