Insecta - Orthoptera - Geraridae

Alternative combination: Genopteryx constricta

Synonyms: Gerarus angustus Handlirsch 1906, Gerarus danielsi Handlirsch 1906, Gerarus latus Handlirsch 1911, Gerarus longus Handlirsch 1906, Gerarus reductus Handlirsch 1911, Rossites inopinus Richardson 1956

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 fischeri, Gerarus mazonus, Gerarus teutonicus, Gerarus vetus

Type specimens:

• Gerarus constrictus: Its type locality is Mazon Creek, USNM Lacoe Collection, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois
• Gerarus angustus: USNM 38811, a wing. Its type locality is Mazon Creek, USNM Lacoe Collection, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois.
• Gerarus danielsi: Its type locality is Mazon Creek, USNM Lacoe Collection, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois.
• Gerarus latus: YPM 33, a forewing. Its type locality is Mazon Creek (YPM collection), which is in a Westphalian D deltaic mudstone in the Carbondale Formation of Illinois.
• Gerarus longus: USNM 38822, a wing. Its type locality is Mazon Creek, USNM Lacoe Collection, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois.
• Gerarus reductus: YPM 35, a wing (fragments of right wings). Its type locality is Mazon Creek (YPM collection), which is in a Westphalian D deltaic mudstone in the Carbondale Formation of Illinois.
• Rossites inopinus: FMNH PE981, a wing. Its type locality is Kavanaugh Road strip mine, which is in a Westphalian D interdistributary bay mudstone in the Carbondale Formation of Illinois.

Average measurements (in mm): forewing length 42.0, hindwing 45.0 x 14.0, wing 46.0 x 8.2