Ectocochleate cephalopod

Ectocochleate cephalopod; Temporal range: late Cambrian–recent[1] PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda

The ectocochleate (externally shelled)[1] cephalopods are the oldest known representatives of their class, dating back to the Cambrian period.[1] Their aragonitic shells are not prone to fossilisation.[2] They contain the modern Nautilus and many fossil forms including the ancient Ellesmerocerida and the ammonoids.[1]

References

Peter Boyle; Rodhouse, Paul (2004). "3: Origin and evolution". Cephalopods : ecology and fisheries. Ames, Iowa: Blackwell Pub. doi:10.1002/9780470995310.ch3. ISBN 0-632-06048-4.
Henderson, ROBERT A.; MacNamara, Kenneth J. (1985). "Taphonomy and ichnology of cephalopod shells in a Maastrichtian chalk from Western Australia". Lethaia. 18 (4): 305. doi:10.1111/j.1502-3931.1985.tb00710.x.

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[Boyle3-1] Peter Boyle; Rodhouse, Paul (2004). "3: Origin and evolution". Cephalopods : ecology and fisheries. Ames, Iowa: Blackwell Pub. doi:10.1002/9780470995310.ch3. ISBN 0-632-06048-4.

[Henderson1985-2] Henderson, ROBERT A.; MacNamara, Kenneth J. (1985). "Taphonomy and ichnology of cephalopod shells in a Maastrichtian chalk from Western Australia". Lethaia. 18 (4): 305. doi:10.1111/j.1502-3931.1985.tb00710.x.