Anapachydiscus
Anapachydiscus Temporal range: 85.8–66 Ma | |
---|---|
Anapachydiscus wittekindi | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | Ammonoidea |
Superfamily: | Desmocerataceae |
Family: | Pachydiscidae |
Genus: | Anapachydiscus Yabe & Shimizu, 1926 |
Anapachydiscus is an extinct cephalopod genus from the Upper Cretaceous, Coniacian - Maastrichtian of Europe, Africa, Madagascar, S.India, N Z, Calif. Mexico, Argentina, and the Antarctic belonging to the ammonoid family Pachydiscidae.
Anapachydiscus has a rather involute shell with a broad to moderately compressed whorl section. Early whorls smooth, intermediary develop straight or slightly curved, radial ribs that thicken toward the umbilicus. Outer whorls may again be smooth, or have coarse ribs so as to resemble Eupachydiscus.
References
- Treatise on invertebrate Paleontology, Part L, Mollusca 4. Mesozoic Ammonoidea. Geological Society of America and Univ. Kansas Press (1957)
- Anapachydiscus-Paleodb 5/02/11
This article is issued from Wikipedia - version of the Thursday, December 10, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.