''Tornoceras'' is a strongly involute, subdiscoidal Middle and Upper

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

goniatite Goniatids, informally goniatites, are ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniatitids) survi ...

with a suture that forms six to ten lobes. '' Aulatornoceras'', '' Protornoceras'', '' Epitornoceras'', '' Lobotornoceras'' are among related genera included in the

Tornoceratidae Tornoceratidae is a family of goniatitid ammonoids from the middle and upper Devonian. The family is included in the suborder Tornoceratina and the superfamily Tornoceratoidea. Tornoceratids are subdiscoidal goniatitids with biconvex growth l ...

. Inclusion however varies from classification to classification.Goniat- Tornoceratidae
/ref>The Paleobiology Database Tornoceratidae
/ref>

References

Tornoceratidae Goniatitida genera Devonian animals of Europe Devonian animals Late Devonian animals Devonian animals of Africa Middle Devonian first appearances Late Devonian genus extinctions {{Goniatitida-stub