Goniatitida

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(added phylogeny of the Treatise -1957)
(added subsequent developments)
 
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The Goniatitida are divided into two suborders, the [[Tornoceratina]] and the [[Goniatitina]] which represent the two main evolutionary groups within the order shown in the Treatise (Part L). GONIAT online, shows six superfamilies in the Tornoceratina and 16 within the Goniatitina.  
The Goniatitida are divided into two suborders, the [[Tornoceratina]] and the [[Goniatitina]] which represent the two main evolutionary groups within the order shown in the Treatise (Part L). GONIAT online, shows six superfamilies in the Tornoceratina and 16 within the Goniatitina.  
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====Phylogeny in the Treatise -1957====
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===<small>Phylogeny in the Treatise-1957</small>===
The Treatise Part L, 1957, indicates in fig. 12, Phylogeny of Paleozoic Ammonoids, two primary lineages stemming from the Tornoceratidae; 1. the Tornoceratid, beginning with the Tornoceratidae and 2. the Goniatitid, beginning with the Goniatitidae.  The Tornoceratidae, accordingly, gave rise to the Cheiloceratidae from which the  Agathiceratidae, followed by the Shumartitidae, Popanoceratidae, Perrinideae and Cyclolobiidae are subsequently derived.  The Goniatitidae, which seems to have its origin the the Cheiloceratidae  gave rise to the Neoicoceratidae and Schistoceratidae which are followed by the Metalegoceratidae and Adrianitidae, and also gave rise to the Dimorphoceratidae which in turn gave rise to the Thalassoceratidae.
The Treatise Part L, 1957, indicates in fig. 12, Phylogeny of Paleozoic Ammonoids, two primary lineages stemming from the Tornoceratidae; 1. the Tornoceratid, beginning with the Tornoceratidae and 2. the Goniatitid, beginning with the Goniatitidae.  The Tornoceratidae, accordingly, gave rise to the Cheiloceratidae from which the  Agathiceratidae, followed by the Shumartitidae, Popanoceratidae, Perrinideae and Cyclolobiidae are subsequently derived.  The Goniatitidae, which seems to have its origin the the Cheiloceratidae  gave rise to the Neoicoceratidae and Schistoceratidae which are followed by the Metalegoceratidae and Adrianitidae, and also gave rise to the Dimorphoceratidae which in turn gave rise to the Thalassoceratidae.
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The Goniatitidae, with subfamilies, Neoicoceratidae, Metalegoceratidae and Schistoceratidae are combined in the Goniatitaceae; the Adrianitidae as its own superfamily, Adrianitaceae; the Dimophoceratidae and Thalassoceratidae in the Dimorphocerataceae.  These three superfamilies were the original Goniatitina.  
The Goniatitidae, with subfamilies, Neoicoceratidae, Metalegoceratidae and Schistoceratidae are combined in the Goniatitaceae; the Adrianitidae as its own superfamily, Adrianitaceae; the Dimophoceratidae and Thalassoceratidae in the Dimorphocerataceae.  These three superfamilies were the original Goniatitina.  
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===<small>Subsequent developments -Current persepctives</small>===
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One of the more significant developments since the first edition of the Treatise, part L, is the elevation of the Goniatitina to full ordinal status as the Goniatitida, which allowes phylogenetically related superfamilies to be brought together as the  suborders Tornoceratina  and Goniatitna.
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Another is the use of the --oidea ending for superfamlies by some, as proscribed by the ICZN. More significant however are the rearrangements and addition of new families and superfamilies.
==''References''==
==''References''==

Latest revision as of 17:32, 22 June 2011

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