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References
- ↑ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database" . Retrieved 2014-05-28.
- ↑ Die ammonitiden des norddeutschen Neocom (Valan ginien, Hauterivien, Barrêmien und Aptien. A von Koenen, 1902
- ↑ Lehmann, U. 1981. The ammonites: Their life and their world. London: Cambridge University Press.
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