The impossibility of inverted suture lines in ammonites
Article first published online: 9 OCT 2007
Volume 11, Issue 4, pages 307–313, October 1978
How to Cite
BAYER, U. (1978), The impossibility of inverted suture lines in ammonites. Lethaia, 11: 307–313. doi: 10.1111/j.1502-3931.1978.tb01887.x
- Issue published online: 9 OCT 2007
- Article first published online: 9 OCT 2007
The biological organization of ammonites does not permit a true inversion of suture lines to occur. However, the complex pattern of the ammonite phragmocone - nacreous septa, membrane coverings, siphuncle, and soft body - does show ‘weak points’ in growth regulation. This provides several instabilities which lead to a pseudo-inversion caused by mechanical compression of the saddles.