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Sutures and Septa in Jurassic Ammonite Systematics

Published online by Cambridge University Press:  01 May 2009

W. J. Arkell
W. J. Arkell
Affiliation:
Sedgwick Museum, Cambridge.
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Abstract

In the suborder Ammonitina the form of the septa and sutures is strongly influenced by whorl-shape and is often highly variable within the species and even the inidvidual. Claims that septa and sutures are specially significant because they are “internal characters” are refuted, as are also claims for overriding priority in classification for particular parts of the sutures, or for details of their early pntogenetic stages, or for the inner surfaces of the septa. Interpretation of the form of the septa and sutures as primarily conditioned by external water pressure is challenged. A recent revision of two superfamilies on the basis of septal form is held to involve unnatural groupings.

Type
Articles
Information
Geological Magazine , Volume 94 , Issue 3 , June 1957 , pp. 235 - 248
Copyright
Copyright © Cambridge University Press 1957

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References

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