Heteroceras
| Heteroceras Temporal range: Barremian–Aptian | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Suborder: | Ancyloceratina |
| Superfamily: | Ancylocerataceae |
| Family: | Heteroceratidae |
| Genus: | Heteroceras D'Orbigny, 1849 |
Heteroceras is a Lower Cretaceous heteromorph ammonite belonging to the ancyloceratacian family, Heteroceratidae, characterized by a helically coiled juvenile shell at the apex followed by slightly curved adult shaft, with a J-shaped section at the end of it. The shell is ribbed; ribs are concave and oblique on the helix, straight and transverse on the later stages.
Heteroceras has been found in France, central Europe, the Caucasus, and Peru. Related genera are Hemibaculites and Cochidites. The family, Heteroceratidae, is a derivative of the Ancyloceratidae.
References
- Arkell, et al 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America and Univ. Kansas Press.
- Heteroceraras- Paleodb
- For illustrations see Genre Heteroceras, Orbigny 1850
This article is issued from Wikipedia - version of the 8/16/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.