Lytocrioceras

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

Last updated February 06, 2026

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.

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