Ammonitida

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* Order: '''Ammonitida'''
* Order: '''Ammonitida'''
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The '''Ammonitida''' comprises advanced ammonoids from the Jurassic and Cretaceous periods, characterized by closely coiled, mostly planispiral shells thaat are commonly thick, often but not universally with strong ornament, and ammonitic sutures that lack the moss-like complexity found in the [[Lytoceratida]] and in which saddles are only rarely phylloid or lobes bifid and tending to become simplified in later forms.  
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The '''Ammonitida''' comprises advanced ammonoids from the Jurassic and Cretaceous periods, characterized by closely coiled, mostly planispiral shells thaat are commonly thick, often but not universally with strong ornament, and ammonitic sutures that lack the moss-like complexity found in the [[Lytocerida]] and in which saddles are only rarely phylloid or lobes bifid and tending to become simplified in later forms.  
==Taxonomy==
==Taxonomy==

Revision as of 13:40, 15 April 2013

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