Gatunek typowy
Lyrogoniatites newsomi georgiensis Miller & Furnish,1940

Opis

Conch thick discoidal to spherical with umbilicus moderately wide, opening continuously in all stages; ornamentation with 30-60 strong spiral longitudinal lirae and fine, almost straight growth lines; strong, regularly occurring shell constrictions; lobe line with narrow to moderately narrow external lobe, its flanks are hardly curved; median saddle low, ventrolateral saddle broadly rounded; symmetrical adventitious lobe with barely curved flanks.

Synonimy

Zasięg czasowy

Carboniferous, Serpukhovian

Literatura

Korn, D. 1988. Die Goniatiten des Kulmplattenkalkes (Cephalopoda, Ammonoidea; Unterkarbon; Rheinisches Schiefergebirge). Geologie und Palåontologie in Westfalen 11: 1–293.

Miller, A. K. & Furnish, W. M. 1940. Studies of Carboniferous ammonoids I-IV. Journal of Paleontology 14: 356-377.