Ceratitida

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Ceratitids produced a variety of shells, varying from thinly discoidal evolute to subglobular involute, and from smooth to variably sculpted with ribs and/or nodes. Sutures are generally ceratitic with smooth saddles and serrate lobes, but may be goniatitic or variably ammonitic. Some species even became uncoiled, like the earlier nautiliod  [[Lituitidae]] and later ammonoid [[Baculitidae]].  
Ceratitids produced a variety of shells, varying from thinly discoidal evolute to subglobular involute, and from smooth to variably sculpted with ribs and/or nodes. Sutures are generally ceratitic with smooth saddles and serrate lobes, but may be goniatitic or variably ammonitic. Some species even became uncoiled, like the earlier nautiliod  [[Lituitidae]] and later ammonoid [[Baculitidae]].  
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The Ceratitida began in the Late Permian with the evolute, discoidal Xenodiscidae, derived from the prolecanitid [[Daraelitidae]], and seem to form a monophyletic group. Sixteen superfamilies are recognized, shown in the following  temporally arranged groups.
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The Ceratitida began in the Late Permian with the evolute, discoidal Xenodiscidae, derived from the prolecanitid [[Daraelitidae]], and seem to form a monophyletic group. Sixteen superfamilies are recognized, as shown, beginning with the earliest as arranged in more or less temporal sequence. Further indented taxa are derived from the preceding taxa where they had been included as families.
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''Middle Permian to Early Triassic''
 
:[[Xenodiscaceae]]  
:[[Xenodiscaceae]]  
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:[[Otocerataceae]]
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''Early Triassic''
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:[[Dinaritaceae]]
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''Early-Middle Triassic''
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:[[Meekocerataceae]]  
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:[[Noritaceae]]
:[[Noritaceae]]
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''Early-Late Triassic''
 
:[[Ceratitaceae]]
:[[Ceratitaceae]]
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::[[Dinaritaceae]]
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::[[Danubitaceae]]
:[[Clydonitaceae]]
:[[Clydonitaceae]]
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::[[Trachycerataceae]]
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::[[Choristocerataceae]]
:[[Pinacocerataceae]]
:[[Pinacocerataceae]]
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''Middle-Late Triassic''
 
:[[Arcestaceae]]
:[[Arcestaceae]]
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:[[Danubitaceae]]
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::[[Megaphyllitaceae]]  
:[[Lobitaceae]]
:[[Lobitaceae]]
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:[[Megaphyllitaceae]]
 
:[[Nathorstitaceae]]
:[[Nathorstitaceae]]
:[[Ptychitaceae]]
:[[Ptychitaceae]]
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:[[Trachycerataceae]]
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:[[Tropitaceae]]
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:[[Tropitaceae]]''
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''Late Triassic''
 
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:[[Choristocerataceae]]
 
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[[Sagecerataceae]], included, probably belongs to the Prolecanitida.
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The [[Sagecerataceae]] which are included in some classifications probably belong to the [[Prolecanitida]].
==<small>''References''</small>==
==<small>''References''</small>==

Revision as of 15:25, 13 July 2011

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