Sactorthoceratidae

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m (Protected "Sactorthoceratidae" ([move=sysop] (indefinite)))
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The Middle Ordovician to Upper Silurian sactorthoceratid lineage includes the paraphyletic Sactorthoceratidae, Clinoceratidae and Ascocerida. The Sactorthoceratidae and Clinoceratidae were orthoconic or cyrtoconic longicones without endosiphuncular or cameral deposits (Sweet 1964). Septal necks were orthochoanitic or suborthochoanitic in Sactorthoceratidae and Ascocerida, cyrtochoanitic in Clinoceratidae (Furnish & Glenister 1964, Sweet 1964). Ascocerids were distinguished by inflated siphuncles and the periodic shedding of the apical parts of the conch; in the Ascoceratidae, the adoral portion of the conch became greatly swollen, followed by shedding of the juvenile section of the conch to produce a breviconic adult form (Furnish & Glenister 1964).
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The '''Sactorthoceratidae''' is a family of [[Michelinoceratida]] generally characterized by orthocones with subcentral siphuncles of slightly expanded segments, lacking cameral and siphonal deposits.
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==Phylogeny/Taxonomy==
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Sactorthoceratids were apparently derived from the [[Michelinoceratidae]] at the beginning of Chazyan in the Middle Ordovician and seem to have died out without giving rise to further forms. Includes ''Sactorthocentas'', ''Centroonoceras'', and ''Sigmocycloceras''.     
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[[Michelinoceratida|<==]]Sactorthoceratidae
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    |--''Sactorthoceras'' Kobayashi 1934 [incl. ''Sigmorthoceras'' Kobayashi 1934] S64
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    |    `--*''S. gonioseptum'' Kobayashi 1934 S64
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    |--''Sigmocycloceras'' Kobayashi 1934 S64
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    |    `--*''S. kogenense'' (Kobayashi 1927) [=''Protocycloceras kogenense''] S64
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     `--+--''Centroonoceras'' Kobayashi 1934 [incl. ''Cyrtoonoceras'' Flower 1939] S64
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      |    `--*''C. tokunagai'' (Kobayashi 1927) [=''Ooceras tokunagai''] S64
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      `--+--Clinoceratidae S64
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          |    |--''Whiteavesites'' Foerste 1929 S64
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          |    |    `--*''W. winnipegense'' (Whiteaves 1892) [=''Orthoceras winnipegense''] S64
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          |    |--''Clinoceras'' Mascke 1876 [=''Clynoceras'' (''l. c.'')] S64
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          |    |    |--*''C. dens'' Mascke 1876 S64
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          |    |    `--''C. exiguum'' P68
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          |    `--''Whitfieldoceras'' Foerste 1932 S64
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          |        |--*''W. mumiaeforme'' (Whitfield 1882) [=''Oncoceras mumiaeforme''] S64
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          |        |--''W. baffinense'' Foerste 1932 P68
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          |        |--''W. minimum'' Foerste 1935 P68
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          |        `--''W. trentonense'' Foerste 1932 P68
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          `--Ascocerida [Ascoceracea, Ascoceratina, Ascoceratida, Ecdyceratida, Mixochoanites] S64
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              |--''Choanoceras'' Lindström 1890 (see below for synonymy) FG64
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              |    `--*''C. mutabile'' Lindström 1890 FG64
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              |--Hebetoceratidae FG64
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              |    |--''Hebetoceras'' Flower 1941 FG64
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              |    |    `--*''H. mirandum'' Flower 1941 FG64
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              |    |--''Ecdyceras'' Flower 1941 [incl. ''Pachecdyceras'' Flower 1947] FG64
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              |    |    `--*''E. sinuiferum'' Flower 1941 FG64
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              |    `--''Montyoceras'' Flower 1941 FG64
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              |        `--*''M. arcuatum'' Flower 1941 FG64
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              `--Ascoceratidae [Ascocératides] FG64
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                    |--Probillingsitinae FG64
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                    |    |--''Shamattawaceras'' Foerste & Savage 1927 FG64
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                    |    |    `--*''S. ascoceroides'' Foerste & Savage 1927 FG64
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                    |    `--''Probillingsites'' Foerste 1928 FG64
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                    |        |--*''P. welleri'' Foerste 1928 FG64
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                    |        |--''P. belli'' Miller, Youngquist & Collinson 1954 P68
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                    |        |--''P. milleri'' Foerste 1935 P68
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                    |        |--''P. pronis'' FG64
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                    |        `--''P. sutherlandi'' FG64
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                    `--Ascoceratinae [Schuchertoceratidae] FG64
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                        |--''Aphragmites'' Barrande 1865 FG64
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                        |    `--*''A. buchi'' (Barrande 1855) [=''Ascoceras buchi''] FG64
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                        |--''Lindstroemoceras'' Miller 1932 FG64
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                        |    `--*''L. dolium'' (Lindström 1890) [=''Ascoceras dolium''] FG64
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                        |--''Glossoceras'' Barrande 1865 FG64
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                        |    |--*''G. gracile'' (Barrande 1865) [=''Ascoceras'' (*''Glossoceras'') ''gracile''] FG64
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                        |    `--''G. lindstroemi'' FG64
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                        |--''Billingsites'' Hyatt 1884 [=''Billingoceras'' (''l. c.'')] FG64
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                        |    |--*''B. canadensis'' (Billings 1857) [=''Ascoceras canadense''] FG64
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                        |    |--''B. landerensis'' Foerste 1835 P68
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                        |    `--''B. williamsportensis'' Foerste 1924 P68
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                        |--''Schuchertoceras'' Miller 1932 FG64
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                        |    |--*''S. anticostiense'' (Billings 1866) [=''Ascoceras anticostiense''] FG64
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                        |    |--''S. newberryi'' FG64
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                        |    `--''S. thomasi'' [=''S. iowaense''] FG64
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                        |--''Ascoceras'' Barrande 1847 (see below for synonymy) FG64
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                        |    |--*''A. bohemicum'' Barrande 1855 FG64
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                        |    |--''A. collare'' FG64
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                        |    |--''A. lagena'' FG64
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                        |    `--''A. manubrium'' FG64
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                        `--''Parascoceras'' Miller 1932 [incl. ''Pseudascoceras'' Miller 1932, ''Pseudoscoceras'' (''l. c.'')] FG64
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                              |--*''P. fistula'' (Lindström 1890) [=''Ascoceras fistula''] FG64
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                              |--''P. decipiens'' FG64
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                              |--''P. pupa'' FG64
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                              `--''P. sipho'' FG64
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''Ascoceras'' Barrande 1847 [=''Asoceras'' (''l. c.''), ''Cryptoceras'' Barrande 1846 (''n. n.'') ''non'' Latreille 1804] FG64
 
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''Choanoceras'' Lindström 1890 [=''Choaniceras'' Lindström 1888 (''n. n.''), ''Choniceras'' (''l. c.''), ''Coanoceras'' (''l. c.''); Choanoceratidae] FG64
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==''References''==
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<nowiki>*</nowiki> Type species of generic name indicated
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Flower, R. H. 1976  Ordovician Cephalopod Faunas and Their Role in Correlation. The Ordovician System: Proceedings of a Palaeontologic Society Symposium.
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Flower, R. H. 1962 Notes on the Michellinoceratida  Mem 9, New Mexico Institute of Mineral Technology, Socorro, NM
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Sweet, W. C. 1964. Nautiloidea – Orthocerida. In ''Treatise on Invertebrate Paleontology'' Part. K. ''Mollusca 3. Geological Society of America and University of Kansas Press.
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==References==
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'''Credits'''<br/>
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[[user:john M|John]] 21 July 2014
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[FG64] Furnish, W. M., & B. F. Glenister. 1964. Nautiloidea – Ascocerida. In ''Treatise on Invertebrate Paleontology'' pt. K. ''Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea'' (R. C. Moore, ed.) pp. K261-K277. The Geological Society of America and the University of Kansas Press.
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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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[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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'''Credits'''
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[[User:Christopher|Christopher]] 21:58, 27 January 2011 (UTC)
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Latest revision as of 22:37, 21 July 2014

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