| Megalytoceratinae Temporal range: | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Lytoceratidae |
| Subfamily: | †Megalytoceratinae Spath, 1927 |
| Genera[1] | |
| |
Megalytoceratinae is a subfamily of lytoceratids ammonites consisting of planulate forms, i.e. those with moderately evolute compressed shells with bluntly rounded venters, in which the outer whorls become smooth and sutures tend to resemble those of the Perisphinctidae. The family includes three genera, Megalytoceras, and Metrolytoceras, from the Middle Bajocian of England, Perilytoceras from the Toarcian and a fourth possible member, Asapholytoceras, from the Toacian of southeastern Europe.
References
- ↑ Paleobiology Database - Megalytoceratinae. 2017-10-19.
- W.J.Arkell, B.Kummel, & C.W.Wright 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L Ammonoidea. R.C.Moore, (ed).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.