Ancylocerida

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'''Ancylocerida'''
'''Ancylocerida'''
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The Ancylocerida, sometimes referred to as the Ancyclocerina, is a  polyphyletic assemblage of  various, some heteromorphic, neoammonoids derived at different times from different [[Lytocerida|Lytrocerids]]. As such the term has only morphologic, that is descriptive, meaning.  
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The Ancylocerida, sometimes referred to as the Ancyclocerina, may be a  polyphyletic assemblage of  various, some heteromorphic, neoammonoids derived at different times from different [[Lytocerida|Lytrocerids]]. If so, the term has only a morphologic meaning.  
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The Ancylocerida as perceived includes three superfamilies, sequentially the  Ancylocerataceae,  Turrilitaceae, and Scaphitaceae. [1] . The revised ICZN -oidea ending is sometimes found used instead. 
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The Ancylocerida as perceived includes three superfamilies, sequentially the  Ancylocerataceae,  Turrilitaceae, and Scaphitaceae<small><sup>[1]</sup></small> which systematically might best be kept in the Lytocerida.  
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Systematically the Ancylocerataceae,  Turrilitaceae, and Scaphitaceae belong to the Lytocerida.  
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==Ancylocerataceae==
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==Included Superfamilies==
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===Ancylocerataceae===
The Ancylocerataceae are loosely coiled or uncoiled derivitives of [[Late Jurassic]] ([[Tithonian]]) lytoceratids, some straight or with hook-shaped body chambers, through the ancestral Bochianitidae. The Bochianitidae, which ranges in the [[Lower Cretaceous]] stratigraphically into the Lower [[Aptian]], gave rise at the end of the [[Valanginian]], about half way through its range, to the Ancyloceratidae. The Ancyloceratidae in tern gave rise in the subsequent [[Hauterivian]] to the Hemihoplitidae and in the next to come [[Barremian]] to the Heteroceratidae. The Ancyloceratidae has a stratigraphic range that carries it into the Lower [[Albian]], the Hemihoplitidae and Heteroceratidae have much shorter ranges and died out well before.  
The Ancylocerataceae are loosely coiled or uncoiled derivitives of [[Late Jurassic]] ([[Tithonian]]) lytoceratids, some straight or with hook-shaped body chambers, through the ancestral Bochianitidae. The Bochianitidae, which ranges in the [[Lower Cretaceous]] stratigraphically into the Lower [[Aptian]], gave rise at the end of the [[Valanginian]], about half way through its range, to the Ancyloceratidae. The Ancyloceratidae in tern gave rise in the subsequent [[Hauterivian]] to the Hemihoplitidae and in the next to come [[Barremian]] to the Heteroceratidae. The Ancyloceratidae has a stratigraphic range that carries it into the Lower [[Albian]], the Hemihoplitidae and Heteroceratidae have much shorter ranges and died out well before.  
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The Hemihoplitidae are characterized by tighter coiling, the Heteroceratidae by intial coiling that is helical.
The Hemihoplitidae are characterized by tighter coiling, the Heteroceratidae by intial coiling that is helical.
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== Turrilitaceae ==
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=== Turrilitaceae ===
The Turrilitaceae is a collection of mostly [[Upper Cretaceous]] aberrant derived Lytocerids which are commonly coiled in a helix or become uncoiled, or both; exhibiting almost every known heteromorphic form.  
The Turrilitaceae is a collection of mostly [[Upper Cretaceous]] aberrant derived Lytocerids which are commonly coiled in a helix or become uncoiled, or both; exhibiting almost every known heteromorphic form.  
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The Turritlitdae gave rise to the Nostroceratidae late in the Cenomanian.  The Nostroceratidae in tern gave rise to the Diplomoceratidae near the end of the Turonian.  The Turrilitidae range from the Middle Albian only to the Turonian but the Nostroceratidae reached the end of the Cretaceous (upper Maastricht), the Diplomiceratidae almost.
The Turritlitdae gave rise to the Nostroceratidae late in the Cenomanian.  The Nostroceratidae in tern gave rise to the Diplomoceratidae near the end of the Turonian.  The Turrilitidae range from the Middle Albian only to the Turonian but the Nostroceratidae reached the end of the Cretaceous (upper Maastricht), the Diplomiceratidae almost.
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== Scaphitaceae ==
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=== Scaphitaceae ===
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==>Reference Note<==
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=== Included normally coiled groups ===
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At least one, well known reference has added the Deshayesitaceae and Douvilleicerataceae, respectively the Deshayesitidae and Douvilleiceratidae, families in the ammonitid Desmocerataceae, to the (null) Ancylocerida.
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At least one, well known reference has added the Deshayesitaceae and Douvilleicerataceae, respectively the Deshayesitidae and Douvilleiceratidae, families in the ammonitid Desmocerataceae, to the Ancylocerida.
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==<References>==
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==''References''==
*[1] Arkell, et al, Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America, 1957. R.C. Moore,(ed).
*[1] Arkell, et al, Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America, 1957. R.C. Moore,(ed).
JM 7/07/10
JM 7/07/10

Latest revision as of 14:21, 8 June 2012

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