Planitornoceras

Planitornoceras
Temporal range: Famennian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Goniatitida
Family: Tornoceratidae
Subfamily: Aulatornoceratinae
Genus: Planitornoceras
Becker, 1995
Species
  • See text

Planitornoceras is a genus included in the geniatitid subfamily Aulatornoceratinae that lived during the Famennian stage at the end of the Devonian. Its shell is extremely compressed, subinvolute to subevolute with an open umbilucus. Sides are always flat, outer rim (=venter) tabulate to slightly keeled. No constrictions or spiral grooves, but some species have broad spiral depressions. The adventitious lobe of the suture is widely rounded and asymmetric, the ventral lobe and saddle small, the dorsolateral saddle relatively short.

References

This article is issued from Wikipedia - version of the Monday, July 16, 2012. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.