Discosorida

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(Phylogeny: llinked families in diagram)
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The Discosorida is an  order of nautiloid cephalopods from the early Paleozoic characterized by their rather unique siphuncle in whicb the connecting rings are zoned along their length and hook into the previous septal foramina as well as being expanded into the chambers. Discosorids produced shells that were generally breviconic or cyrtoconic. Cyrtoconic shells were typically compressed and were either endogastric with the venter longitudinally concave or exogastric with the venter longtiuinally convex.
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The Discosorida is an  order of nautiloid cephalopods from the early Paleozoic characterized by their rather unique siphuncle in which the connecting rings are zoned along their length and hook into the previous septal foramina as well as being expanded into the chambers. Discosorids produced shells that were generally breviconic or cyrtoconic. Cyrtoconic shells were typically compressed and were either endogastric with the venter longitudinally concave or exogastric with the venter longtiuinally convex.
==Diagnosis==
==Diagnosis==
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       `--[[Westonoceratidae]]
       `--[[Westonoceratidae]]
           `-[[Lowoceratidae]]
           `-[[Lowoceratidae]]
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             `-[[Discosoridiae]]
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             `-[[Discosoridae]]
==References==
==References==

Revision as of 17:49, 29 November 2012

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