Leurocycloceras
Leurocycloceras is an extinct genus of actively mobile carnivorous cephalopod, essentially a nautiloid, that lived in what would be North America, Europe, and Asia during the Silurian from 443.7—418.7 mya, existing for approximately.
Leurocycloceras is an extinct genus of actively mobile carnivorous cephalopod, essentially a nautiloid, that lived in what would be North America, Europe, and Asia during the Silurian from 443.7—418.7 mya, existing for approximately.