Lytocrioceras
| Lytocrioceras Temporal range: Barremian | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Order: | Ammonitida |
| Suborder: | Ancyloceratina |
| Family: | Ancyloceratidae |
| Genus: | Lytocrioceras Spath, 1924 |
| Species | |
| |
Lytocrioceras is a genus of ancyloceratine ammonites from the Lower Cretaceous with a shell that resembles a safety pin. The shell begins as a loosely wound spiral, followed by a straight shaft which makes a U-turn to go back is somewhat the opposite direction, ending in a jog, offset from the original coil.
Lytocrioceras was originally included in the Ancyloceratidae (Lytoceratina),[1] united with other similar forms but has since been reassigned to the Macroscaphitidae.[2]
References
- ↑ Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
- ↑ Vermeulen, J. (1999). "New data on the stratigraphical ranges, the evolutions and the classifications of three lower Cretaceous ammonites families". Géologie Alpine. 75: 123–132.
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