Tornoceratina
| Tornoceratina Temporal range: Middle Devonian - Middle Permian | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Goniatitida |
| Suborder: | †Tornoceratina Wedekind, 1914 |
| Superfamilies | |
| |
Tornoceratatina is one of two suborders included in the Goniatitida, characterized by generally involute, subdiscoidal shells and by sutures in which the ventral ones are undivided.
Sutural lobes increase in number during the course of life of the individual, typically developed from the internal and external saddles. The siphuncle is prochoanitic, with septal necks projecting forward.
Derivation is from the Anarcestida in the middle Devonian.
References
- Miller, Furnish, and Schindewolf, 1957. Paleozoic Ammonoidea. Treastise on Invertebrate Paleontology, Part L. Geological Society of America.
- Tornoceratina in Goniat on line, Mar. 5, 2015
- The Paleobiology Database Oct.1, 2007
This article is issued from Wikipedia - version of the 12/27/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.