Westonoceratidae

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m (Protected "Westonoceratidae" ([move=sysop] (indefinite)))
(linked Lowoceratide)
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The Middle Ordovician to Middle Devonian westonoceratid lineage included the paraphyletic Westonoceratidae and its descendant families Lowoceratidae and Discosoridae.
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The Middle Ordovician to Middle Devonian westonoceratid lineage included the paraphyletic Westonoceratidae and its descendant families [[Lowoceratidae]] and Discosoridae.
'''Characters''' (from Teichert 1964): Conchs mostly compressed exogastric cyrtocones (endogastric in Discosoridae, slender in Lowoceratidae); siphuncles moderate-sized; apertures constricted or open. Connecting rings thin to moderately thick; bullettes inflated in early forms, less so in adult Lowoceratidae and Discosoridae; parietal deposits in interior of siphuncle, forming endocones in later forms. Cameral deposits may be present.
'''Characters''' (from Teichert 1964): Conchs mostly compressed exogastric cyrtocones (endogastric in Discosoridae, slender in Lowoceratidae); siphuncles moderate-sized; apertures constricted or open. Connecting rings thin to moderately thick; bullettes inflated in early forms, less so in adult Lowoceratidae and Discosoridae; parietal deposits in interior of siphuncle, forming endocones in later forms. Cameral deposits may be present.
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                 |      |--*''G. eatonense'' Claypole 1878 [=''Cyrtoceras'' (''Glyptodendron'') ''eatonense''] T64
                 |      |--*''G. eatonense'' Claypole 1878 [=''Cyrtoceras'' (''Glyptodendron'') ''eatonense''] T64
                 |      `--''G. subcompressum'' T64
                 |      `--''G. subcompressum'' T64
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                 `--+--Lowoceratidae T64
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                 `--+--[[Lowoceratidae]] T64
                   |    |--''Lowoceras'' Foerste & Savage 1927 T64
                   |    |--''Lowoceras'' Foerste & Savage 1927 T64
                   |    |    `--*''L. southamptonense'' Foerste & Savage 1927 T64
                   |    |    `--*''L. southamptonense'' Foerste & Savage 1927 T64

Revision as of 23:14, 29 April 2012

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