Tornoceras
Tornoceras, extinct genus of cephalopods, forms related to the modern pearly nautilus. Tornoceras is a form that emerged during the Devonian Period (416 million years to 359 million years ago). The shell is circular in outline and rather flat; the final whorl covers earlier whorls. The sutural pattern between successive chambers of the shell is gently rippled.
Citation Information
Article Title:
Tornoceras
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
17 March 2009
Access Date:
February 17, 2025