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Homeomorphy in Cephalopods


Staff member
Nov 19, 2002
somewhere under the desert sky
Simulation of one ammonite shell morphotype by another. The fossils below are Schloenbachia varians from the lower Cenomanian (Late Cretaceous) from This Site.

And another with a ventral view from this site

The attached photos are Forresteria alluaudi from the Coniacian (also Late Cretaceous but a few million years younger), the robust, spinose morphotypes are very similar, and at least for me, they would be very hard to differentiate by shell shape alone.


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