Westenoceras Foerste, 1924 Westonoceras is an extinct nautiloid genus from the Discosorida 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 The shell of Westonoceras forms a humped exogastric cyrtocone with its greatest height (gibbosity) at the anterior part of the mature phragmocone and posterior body chamber.

The early juvenile portion is slender, gently exogastric or straight and rapidly increasing in size.

Septal necks are strongly recumbent; connecting rings thick, with inflated bullettes.

Parietal deposits grow forward from the septal foremina, commonly forming a continuous internal lining.