''Westonoceras'' is an extinct
nautiloid genus from the
Discosorida
Discosorida are an order of cephalopods that lived from the beginning of the Middle Ordovician, through the Silurian, and into the Devonian. Discosorids are unique in the structure and formation of the siphuncle, the tube that runs through an ...
that lived during the Middle and Late
Ordovician that has been found in North America, Greenland, and Northern Europe. It is the
type genus for the
Westonoceratidae
Westonoceratidae are exogastric, mostly compressed, Discosorida of moderate size from the Middle Ordovician to the Lower Silurian.
The siphuncle is typically close to the convexly curved outer margin of the phragmocone – the chambered part o ...
Description
The shell of ''Westonoceras'' forms a humped