Choristocerataceae

Choristocerataceae; Temporal range: Norian–Rhaetian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ceratitida
Superfamily:	†Choristocerataceae; Hyatt, 1900
Families
	; ; ;

Choristocerataceae is a superfamily of Late Triassic ceratitidan ammonites. They can be characterized by their simple, four-lobed suture lines and unusual heteromorph shell shapes, which can resemble straight rods or twisting cones rather than the flat coils typical of other ammonites. The shells are usually small (less than 3 cm long) and ornamented with prominent ribbing.^[1]^[2]

References[]

^ Shevyrev, A. A. (2005). "Heteromorph Ammonoids of the Triassic: A Review" (PDF). Paleontological Journal. 39 (supp5): S614–S628.
^ Tozer, E. T. (August 1971). "Triassic Time and Ammonoids: Problems and Proposals". Canadian Journal of Earth Sciences. 8 (8): 989–1031. Bibcode:1971CaJES...8..989T. doi:10.1139/e71-088.

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[1] Shevyrev, A. A. (2005). "Heteromorph Ammonoids of the Triassic: A Review" (PDF). Paleontological Journal. 39 (supp5): S614–S628.

[2] Tozer, E. T. (August 1971). "Triassic Time and Ammonoids: Problems and Proposals". Canadian Journal of Earth Sciences. 8 (8): 989–1031. Bibcode:1971CaJES...8..989T. doi:10.1139/e71-088.

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