Paratornoceratinae
Paratornoceratinae Temporal range: Devonian | |
---|---|
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Goniatitida |
Family: | †Dimeroceratidae |
Subfamily: | †Paratornoceratinae |
Genera | |
|
Paratornoceratinae is a subfamily of oxyconic dimeroceratids included in the order Goniatitida, a group of Paleozoic ammonoids, which have closer affinity to living coleoids than to Nautilus.
Paratornoceratinae as defined by Ebbighausen, Becker, & Bockwinkel in 2002 comprises three recognised genera with sharp, oxyconic, venters; Acrimeroceras, Paratornoceras, and Polonites. The shell, as described for the type, Paratornoceras, is subglobular and evolute on young stages, but discoidal and with closed umbilicus in the adult.
References
- Ebbighausen, V., Becker, R.T. & Bockwinkel, J. (2002): Morphometric Analyses and Taxonomy of oxyconic Goniatites (Paratornoceratinae n. subfam.)... Proceeding of the Geological Survey, 57, Vienna, 2002.
- The Paleobiology Database Paratornoceratinae entry
- Paratornoceratinae in Goniat - Taxonomy
This article is issued from Wikipedia - version of the Monday, June 08, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.