Discosorida

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(Phylogeny: simplified "dendrogram', made phylogentic. See discussion.)
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The phylogeny of the Discosorida is along three evolutionary lines,  beginning with the Reudemannoceratidae in the lower Middle Ordovician. From the primitive reudemannocerids came the compressed, endogastric Cyrtogomphoceratidae of the Middle and Upper Ordovician which gave rise to the Silurian Phragmoceratidae with their constricted apertures. The Cyrtogomphoceratidae also gave rise in the Middle Ordovician to the exogastric Westonoceratidae which gave rise to the short lived Lowoceratidae from the lowermost Silurian, which in turn gave rise to the Silurian Discosoridae. Finally the Reudemannoceratidae provide the most likely ancestry for the essentially orthoconic Silurian Mandeloceratidae and Mesoceratidae.
The phylogeny of the Discosorida is along three evolutionary lines,  beginning with the Reudemannoceratidae in the lower Middle Ordovician. From the primitive reudemannocerids came the compressed, endogastric Cyrtogomphoceratidae of the Middle and Upper Ordovician which gave rise to the Silurian Phragmoceratidae with their constricted apertures. The Cyrtogomphoceratidae also gave rise in the Middle Ordovician to the exogastric Westonoceratidae which gave rise to the short lived Lowoceratidae from the lowermost Silurian, which in turn gave rise to the Silurian Discosoridae. Finally the Reudemannoceratidae provide the most likely ancestry for the essentially orthoconic Silurian Mandeloceratidae and Mesoceratidae.
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[[Cephalopoda|<==]]Discosorida
 
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    |--+--[[Westonoceratidae]] T64
 
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    |  `--[[Cyrtogomphoceratidae]] T64
 
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    `--[[Ruedemannoceratidae]] T64
 
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        |--[[Ruedemannoceratidae|''Ruedemannoceras'']] Flower 1940 [Ruedemannoceratidae] T64
 
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        |    `--*''R. boycii'' (Whitfield 1886) [=''Cyrtoceras boycii''] T64
 
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        |--[[Ruedemannoceratidae|''Franklinoceras'']] Flower 1957 T64
 
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        |    `--*''F. elongatum'' Flower 1957 T64
 
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        `--+--[[Ruedemannoceratidae|''Madiganella'']] Teichert & Glenister 1952 T64
 
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            |    `--*''M. magna'' Teichert & Glenister 1952 T64
 
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            `--Mandaloceratidae T64
 
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                |--''Pseudogomphoceras'' Flower ''in'' Flower & Teichert 1957 T64
 
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                |    `--*''P. rigidum'' (Barrande 1865) [=''Gomphoceras rigidum''] T64
 
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                `--+--''Mesoceras'' Barrande 1877 [Mesoceratidae] T64
 
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                    |    `--*''M. bohemicum'' Barrande 1877 T64
 
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                    |--''Cinctoceras'' Flower ''in'' Flower & Teichert 1957 T64
 
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                    |    `--*''C. imperiale'' (Barrande 1865) [=''Gomphoceras imperiale''] T64
 
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                    |--''Umbeloceras'' Flower ''in'' Flower & Teichert 1957 T64
 
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                    |    `--*''U. spei'' (Barrande 1865) [=''Gomphoceras spei''] T64
 
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                    |--''Cayugoceras'' Flower 1947 T64
 
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                    |    `--*''C. semiclausum'' (Barrande 1865) [=''Gomphoceras semiclausum''] T64
 
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                    |--''Ovocerina'' Flower 1947 T64
 
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                    |    |--*''O. marsupium'' (Barrande 1865) [=''Gomphoceras marsupium''] T64
 
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                    |    `--''O. alphaeus'' T64
 
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                    `--+--''Vespoceras'' Flower ''in'' Flower & Teichert 1957 T64
 
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                      |    `--*''V. vespa'' (Barrande 18650 [=''Gomphoceras vespa''] T64
 
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                      `--''Mandaloceras'' Hyatt ''in'' Zittel 1900 T64
 
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                            |--*''M. bohemicum'' (Barrande 1865) [=''Gomphoceras bohemicum''] T64
 
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                            |--''M. austini'' Foerste 1934 P68
 
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                            |--''M. hawthornense'' Foerste 1930 P68
 
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                            `--''M. subgracile'' P68
 
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<nowiki>*</nowiki> Type species of generic name indicated
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[[Nautiloidea|<==]]Discosorida  F&T57, T64
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    `--Ruedemannoceratidae
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      |
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      |--Mandaloceratidae   
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      |    `--Mesoceratidae
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      |
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      `---Cyrtogomphoceratidae   
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        |  `--Phragmoceratidae
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        |
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      `--Westonoceratidae
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          `-Lowoceratidae
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            `-Discosoridiae
==References==
==References==

Revision as of 14:51, 27 November 2012

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