Insecta - Blattodea - Archimylacridae

Alternative combination: Promylacris testudo

Full reference: S. H. Scudder. 1890. New types of cockroaches from the Carboniferous deposits of the United States. Memoirs of the Boston Society of Natural History 4(9):401-415

Belongs to Metachorus according to A. Handlirsch 1906

Sister taxon: Metachorus striolatus

Type specimen: Its type locality is Mazon Creek (Columbia School of Mines collection), which is in a Westphalian D deltaic mudstone in the Carbondale Formation of Illinois

Average measurements (in mm): body 23.0 x 10.5, tegmen 16.9 x 8.0