Fusulinidae

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(fixed typo, Schwagerinidae)
(made section on analysis and discussion)
 
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The Fusulinidae, as now defined <small>[1]</small> is one of seven families in the fusulinid (suborder [[Fusulinina]]) supefamily [[Fusulinacea]]. Tests, or shells, are generally fusiform to subcylindrial with flat to moderately fluited septa; walls are of tectum and upper and lower tectoria or tectum and diaphanotheca.  
The Fusulinidae, as now defined <small>[1]</small> is one of seven families in the fusulinid (suborder [[Fusulinina]]) supefamily [[Fusulinacea]]. Tests, or shells, are generally fusiform to subcylindrial with flat to moderately fluited septa; walls are of tectum and upper and lower tectoria or tectum and diaphanotheca.  
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Carl O Dunbar in Cushman 1950 <small>[2]</small>  in discussion of the Fusulinidae, divided the family in to two subfamilies, the Fusulininae, characterized by test walls with diaphanotheca  and the Schwagerininae, characterized by test walls with kariotheca.  The family itself  is characterized by having fluted, or folded, septa which distinguishes it from the Verbeekinidae [2] in which the septa are straight and in which there are secondary, partial,  axial and transverse septa known as septula.
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===Analysis and discussion===
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Carl O. Dunbar in Cushman 1950 <small>[2]</small>  in discussion of the Fusulinidae, divided the family in to two subfamilies, the Fusulininae, characterized by test walls with diaphanotheca  and the Schwagerininae, characterized by test walls with kariotheca.  The family itself  is characterized by having fluted, or folded, septa which distinguishes it from the Verbeekinidae <small>[2]</small> in which the septa are straight and in which there are secondary, partial,  axial and transverse septa known as septula.
Loeblich and Tappan 1964<small>[3]</small>  kept the Fusulinidae essentially as in Cushman 1950, fusulinida (Fusulinacea) with folded or fluited septa and a variety of wall structures including those with daphanotheca and those with kariotheca, as will as those with neither. The Schwagerininae is retained as an included subfamily <small>[3]</small> but the Fusulinindae is further divided into the Schubertellinae and emended Fusulinindae.   
Loeblich and Tappan 1964<small>[3]</small>  kept the Fusulinidae essentially as in Cushman 1950, fusulinida (Fusulinacea) with folded or fluited septa and a variety of wall structures including those with daphanotheca and those with kariotheca, as will as those with neither. The Schwagerininae is retained as an included subfamily <small>[3]</small> but the Fusulinindae is further divided into the Schubertellinae and emended Fusulinindae.   
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Loeblich and Tappan 1988 <small>[1]</small> separates the Schubertellinae as the family [[Schubertellidae]] and the Schwagerininae as the family [[Schwagerinidae]]; defines the Fusulinidae as having  a wall composed of tectum and upper and lower tectora or of tectum and diaphanotheca; a single tunnel and weak to massive chomata.  The Schubertellidae have varied coiling especially in the early stages and a variety of wall structures.  The Schagerinidae have a wall of tectum and alveolar kariotheca and strongly fluted septa.   
Loeblich and Tappan 1988 <small>[1]</small> separates the Schubertellinae as the family [[Schubertellidae]] and the Schwagerininae as the family [[Schwagerinidae]]; defines the Fusulinidae as having  a wall composed of tectum and upper and lower tectora or of tectum and diaphanotheca; a single tunnel and weak to massive chomata.  The Schubertellidae have varied coiling especially in the early stages and a variety of wall structures.  The Schagerinidae have a wall of tectum and alveolar kariotheca and strongly fluted septa.   
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==Dendrogram==
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===Dendrogram===
[[Dainellinae|<==]]Fusulinidae
[[Dainellinae|<==]]Fusulinidae
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<nowiki>*</nowiki> Type species of genus indicated
<nowiki>*</nowiki> Type species of genus indicated
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== References ==
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=== References ===
====text ====
====text ====
[1] Loeblich, Alfred R. Jr and Helen Tappan, 1988. Forminiferal Genera and their Classification. Van Nostrand Reinhold. New York, N.Y.  
[1] Loeblich, Alfred R. Jr and Helen Tappan, 1988. Forminiferal Genera and their Classification. Van Nostrand Reinhold. New York, N.Y.  

Latest revision as of 16:46, 20 June 2011

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