Lytocrioceras

Lytocrioceras; Temporal range: Barremian
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Ammonitida
Suborder:	Ancyloceratina
Family:	Ancyloceratidae
Genus:	Lytocrioceras; Spath, 1924

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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[Arkell1957-1] 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.

[Vermeulen1999-2] 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.