Orthoceratidae

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The Orthoceratidae includes orthocerid cephalopods from the Lower Ordovician to Upper Triassic; however, it is mostly defined by negative characteristics and its monophyly is potentially suspect. Some orthoceratids reached very large sizes.
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'''Orthoceratidae''' M'Coy 1844, are defined in Sweet 1964 as 'Smooth or elaborately ornamented [orthcones], generally subcircular in cross section and with central or subcentral siphuncle that is typically free of endosiphuncular deposits. Range ''L Ord -U Trias''. In that perspective the family is divided into the Orthoceratinae, (''M Ord''), in which the body chamber has 2 to 4  longitudinal furrows; Michelinoceratinae, (''L Ord - U Trias''), Smooth or indistinctly ornamented Orthoceratidae with central or eccentric orthochoanitic empty siphuncle and generally with well developed cameral depostis; Kionoceratidae (''M Ord - L Perm'')  orthoceratids characterized by well developed longitudinal ornaments with or without subordinate transverse ornament; and Leurocycloceratinae, (''M Ord -Sil''), transversely ornamented [Orthoceratidae] with or without subordinate longitudinal striae or lyrae. Some grew to be quite large.  
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'''Characters''' (from Sweet 1964): Smooth or elaborately ornamented conchs, generally subcircular in cross-section; central or subcentral siphuncle generally lacking endosiphuncular deposits.
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Rousseau Flower, 1976, treated Orthoceratidae as a family in the [[Michelinoceratida]], derived from the Michelinoceratidae and restricted to the Middle Ordovicain, equivalent to the Orthoceratinae of Sweet, 1964. He did (Flower 1962) point out problems with the use of the term Orthoceratidae, based on inconsistant hstoric use of the genus ''Orthoceras'' all though he did accept it in the sense of the Orthocertinae in 1976. 
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==Taxonomy==
==Taxonomy==
  [[Michelinoceratida|<==]]Orthoceratidae [Orthocerotidae]
  [[Michelinoceratida|<==]]Orthoceratidae [Orthocerotidae]
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==References==
==References==
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Rousseau H Flower, 1976. Ordovician Cephalopod Faunas and Their Role in Correlation. ''The Ordovician System: Proceedings of a Palaeontological Society Symposium''.
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Rousseau H Flower, 1962. Notes on the Michhelinoceratida.  Mem 9, New Mexico Institute of Mineral Technology.
[H87] Holland, C. H. 1987. The nautiloid cephalopods: a strange success story. ''Journal of the Geological Society'' 144 (1): 1-15.
[H87] Holland, C. H. 1987. The nautiloid cephalopods: a strange success story. ''Journal of the Geological Society'' 144 (1): 1-15.
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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.
[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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[S64] Sweet, W. C. 1964. Nautiloidea – Orthocerida. In ''Treatise on Invertebrate Paleontology'' pt. K. ''Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea'' (R. C. Moore, ed.) pp. K216-K261. The Geological Society of America and the University of Kansas Press.
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[S64] Sweet, W. C. 1964. Nautiloidea – Orthocerida. ''Treatise on Invertebrate Paleontology'' Part. K. ''Mollusca 3''. 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.
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[T64] Teichert, C. 1964. Morphology of hard parts. ibid ''Treatise on Invertebrate Paleontology'' Part. K.  
'''Credits'''
'''Credits'''
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[[User:Christopher|Christopher]] 22:16, 26 January 2011 (UTC)
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[[User:Christopher|Christopher]] 26 January 2011 <br/>
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[[user:John M|John]] 21 July 2014

Latest revision as of 15:39, 21 July 2014

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