Definition of Isorthoceras. Meaning of Isorthoceras. Synonyms of Isorthoceras

- member of the family Cyrtogomphoceratidae. The type species is H. ovalis. Isorthoceras luhai Comb. nov Valid (Stumbur) Ordovician  Estonia A member of the family...
- fossil that is common in many road-cuts around the arch is the extinct Isorthoceras albersi. The geologic layers that make up the Cincinnati Arch are most...
- †Iowatrypa americana †Iowatrypa owenensis †Ischadites †Isorthis †Isorthoceras †Isorthoceras sociale †Isotelus Contents A B C D E F G H I J K L M N O P Q R...
- †Illaenus americ**** †Ischadites †Ischadites iowensis †Isorthoceras †Isorthoceras junceum †Isorthoceras sociale †Isotelus †Isotelus gigas †Isotelus iowensis...
- unidentified comparable form †Isorophus †Isorophus cincinnatiensis †Isorthoceras †Isorthoceras albersi – type locality for species †Isotelus †Isotelus gigas...
- Cyrtactinoceras Ephippiorthoceras Euorthoceras Gangshanoceras Gorbyoceras Isorthoceras Liulinoceras Mesnaquaceras Metephippiorthoceras Monomuchites Orthonybyoceras...
- †Inclytoceras †Indonautilus †Inversoceras †Iowoceras †Irianoceras †Irinites †Isorthoceras †Jangziceras †Jaregoceras †Jasperoceras †Jiagouceras †Joachimoceras †Joldagiroceras...
- †Isorophus austini †Isorophus holbrooki †Isorophus warrenensis †Isorthoceras †Isorthoceras albersi †Isotelus †Isotelus maximus †Isotelus megistos Contents...
- †Isochilina †Isochilina variana – type locality for species †Isorthis †Isorthoceras †Isorthoceras sociale †Isotelus †Isotelus bradleyi – tentative report †Isotelus...
- Graciloceratidae. The type species is I. niger; genus also includes I. consobrinum. Isorthoceras nikwis Sp. nov Valid Kröger & Aubrechtová Late Ordovician Kullsberg Limestone...