Aulococerida

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Aulococerids and belemnites are of such similar character that its often difficult, especially without the posterior juvenile portion, to distinguish one from the other. Most of the Aulococerida lived during the Permian and Triassic, favoring the Tethyan seas. Belemnites are most common in the Boreal seas of the Jurassic and Cretaceous.  
Aulococerids and belemnites are of such similar character that its often difficult, especially without the posterior juvenile portion, to distinguish one from the other. Most of the Aulococerida lived during the Permian and Triassic, favoring the Tethyan seas. Belemnites are most common in the Boreal seas of the Jurassic and Cretaceous.  
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The siphuncle of aulococerids, and belemnites, is like that of the ancestral orthoderids - retrochoanitic, with backward pointing septal necks.  
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The siphuncle of aulococerids, and belemnites, is like that of the ancestral orthocerids - retrochoanitic, with backward pointing septal necks.  
====Subtaxa====
====Subtaxa====

Revision as of 16:39, 7 December 2011

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