Trimeroceratidae

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The Middle Silurian Trimeroceratidae resembled the related Hemiphragmoceratidae in having the shell aperture visored by encroaching lappets. The two families mainly differed in the structure of the siphuncle, that of Trimeroceratidae being slender and without actinosiphonate deposits.
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<u>Systematic Paleontology</u> <br/>
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Class: [[Cephalopoda]]  <br/>
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Subclass: [[Nautiloidea]]  <br/>
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Order: [[Oncocerida]]  <br/>
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Family: Trimeroceratide
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'''Characters''' (from Sweet 1964): Exogastric, mostly compressed brevicones with slender, empty siphuncles. Aperture visored; mature peristome with median dorsal sinus.
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The Trimeroceratidae is a family of Middle [[Silurian]] [[Oncocerida|oncocerids]] characerized in general by compressed exogastric breviconas with a slender, empty siphucle, visored aperture, and a mature peristome with a median dorsal sinus.  
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==Taxonomy==
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Trimeroceratidae superficially resemble the [[Hemiphragmoceratidae]] but instead have slender siphuncles without actinosiphonate deposits and shell curved exogastrically upward contrasting with the downward endogastric curvature characterisitc of the Hemiphramoceratidae
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[[Oncoceratidae|<==]]Trimeroceratidae
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    |--''Clathroceras'' Foerste 1926 S64
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    |    `--*''C. sulcatum'' (Barrande 1865) [=''Phragmoceras sulcatum''] S64
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    |--''Eotrimeroceras'' Foerste 1928 S64
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    |    `--*''E. jupiterense'' Foerste 1928 S64
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    |--''Pentameroceras'' Hyatt 1884 S64
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    |    `--*''P. mirum'' (Barrande 1865) [=''Gomphoceras mirum''] S64
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    |--''Trimeroceras'' Hyatt 1884 S64
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    |    |--*''T. staurostoma'' (Barrande 1865) [=''Gomphoceras staurostoma''] S64
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    |    `--''T. gilberti'' Kindle & Breger 1904
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    |--''Inversoceras'' Hedström 1917 S64
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    |    |--*''I. perversum'' (Barrande 1865) S64 [=''Phragmoceras perversum'' S64; incl. ''I. constrictum'' T64]
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    |    `--''I. percurvatum'' [incl. ''I. barrandei''] T64
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    `--''Stenogomphoceras'' Foerste 1930 S64
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        |--*''S. chadwicki'' Foerste 1930 S64
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        |--''S. contractum'' Foerste 1930 P68
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        |--''S. gracile'' Foerste 1930 P68
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        `--''S. inflatum'' Foerste 1930 P68
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<nowiki>*</nowiki> Type species of generic name indicated
 
==References==
==References==
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[P68] Purnell, L. R. 1968. Catalog of the Type Specimens of Invertebrate Fossils. Part I: Paleozoic Cephalopoda. ''United States National Museum Bulletin'' 262: 1-198.
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Walter C. Sweet, 1964. Nautiloidea- Oncocerida. Treatise on Invertebrate Paleontology, Part K, Mollsca 3. Geological Society of America and University of Kansas Press.  
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[S64] Sweet, W. C. 1964. Nautiloidea – Oncocerida. In ''Treatise on Invertebrate Paleontology'' pt. K. ''Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea'' (R. C. Moore, ed.) pp. K277-K319. The Geological Society of America and the University of Kansas Press.
 
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[T64] Teichert, C. 1964. Morphology of hard parts. In ''Treatise on Invertebrate Paleontology'' pt. K. ''Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea'' (R. C. Moore, ed.) pp. K13-K53. The Geological Society of America and the University of Kansas Press.
 
'''Credits'''
'''Credits'''
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[[User:Christopher|Christopher]] 00:23, 16 January 2011 (UTC)
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[[User:Christopher|Christopher]] 16 January 2011 <br/>
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[[User: John M|John M]]  30 Sept 2014

Latest revision as of 14:37, 30 September 2014

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