Some articles on tornoceras:

Tornoceratidae - Taxonomy
... Tornoceratinae is based on the genus Tornoceras described by Alpheus Hyatt in 1884 ... The Tornoceratinae includes Tornoceras, Epitornoceras, Lobotornoceras,Protornoceras, and Tornia, described in the Treatise (L 1957), along with Crassotornoceras ... Aulatornoceras, type for the Aulatornoceratinae was previously considered a subgenus of Tornoceras and is known from the Upper Devonian of North America and Europe ...