Spirocyclinidae is a family of

foraminifera Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular Ectoplasm (cell biology), ectoplasm for catching food and ot ...

included in the order

Loftusiida Loftusiida is an order of foraminifers in the class Globothalamea. Subtaxa Suborder Ataxophragmiina * Superfamily Ataxophragmioidea ** Family Ataxophragmiidae ** Family † Cuneolinidae ** Family Dictyopsellidae ** Family Dicyclinidae ** ...

. Tests are variably discoidal, aggulitinated with calcareous or microgranular cement. Interiors are complex with chambers partially subdivided. Walls and septa are pierced with ramifying and anastomosing channels. The family presently includes the following genera; ''

Spirocyclina ''Spirocyclina'' is a genus of large forams, with a flat test as much as 10mm in diameter. Coiling is planispiral to slightly asymmetric and mostly involute, some becoming uncoiled with a straight final stage. The final whorl, or stage, has abou ...

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Anchispirocyclina ''Anchispirocyclina'' is a genus of agglutinated discoidal forams known from the upper Jurassic (lower Kimmeridgian) to the lower Cretaceous (lower Valanginan) of Europe, north Africa, USA (North Carolina) and Cuba. The test of ''Anchispirocycl ...

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Haurania ''Haurania'' is a genus of elongated, finely agglutinated benthic foraminifera included in the Spirocyclinidae. The test is free, starting with a brief planispiral coil followed by a straight uncoiled stage. The exterior is imperforate, the inter ...

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Martiguesia ''Martiguesia'' is a genus of agglutinated benthic forams from the Upper Cretaceous (Santonian) of France. The test is free, the early stage planispirally coiled, becoming nearly straight during later growth. The agglutinated wall is externally i ...

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Pseudospirocyclina ''Pseudospirocyclina'' is a genus of large planispirally coiled agglutinated benthic forams with a complex interior known from the upper Jurassic (Kimmeridgian) of Portugal and Morocco. As Foraminifera, ''Pseudospirocyclina'' are biologically, ...

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Qataria ''Qataria'' is a genus of large benthos, benthic Foraminifera, forams with a discoidal test over 6mm in diameter fully developed. The interior is complex with chambers divided into chamberlets. The wall is of microgranular calcite.A.R.Loeblich & ...

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Reissella ''Reissella'' is a genus of benthic forams with a test of microgranular calcite from the upper Cretaceous (Cenomanian) of Israel. The test starts off planispirally enrolled and involute but later may tend to uncoil and flare with as many as te ...

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Sornayina ''Sornayina'' is a genus of benthic forams from the Upper Cretaceous (Coniacian) of France included in the Spirocyclinidae Spirocyclinidae is a family of foraminifera included in the order Loftusiida. Tests are variably discoidal, aggulitinat ...

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Spiraloconulus ''Spiraloconulus'' is a genus of middle Jurassic foram Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granula ...

'', ''

Streptocyclammina ''Streptocyclammina'' is a genus of benthic foram Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular ecto ...

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Timidonella ''Timidonella'' is a genus of large middle Jurassic forams, with microspheric tests up to in diameter. Smaller megalospheric tests may be fan-shaped or kidney-shaped to discoidal with breadths to slightly over 2 mm and a constant thicknes ...

'', and '' Vania''. Previous the subfamily Spyrocylininae according to Loeblich and Tappan, 1964 in the

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

which then included ''Spriocyclina'', ''Anchispirocyclina'', ''Orbitammiina'', and ''Sornayina''. '' Orbitammina'' has been moved to the textulariid Orbitopsellidae where it rests along with '' Orbitopsella'', '' Cyclorbitopsella'', and '' Labyrinthina''. Foraminifera, to which the Spirocyclinidae belong are characterized by reticulate pseudopoda,Short Treatise on Foraminiferology
Jean-Pierre Bellier, Robert Mathieu, & Bruno Granier and often produce intricate shells, or tests. They are referred to as

Sarcodina An amoeba (; less commonly spelled ameba or amœba; plural ''am(o)ebas'' or ''am(o)ebae'' ), often called an amoeboid, is a type of cell or unicellular organism with the ability to alter its shape, primarily by extending and retracting pseudopo ...

in older texts, and more recently as Retaria

References

* Alfred R. Loeblich, jr & Helen Tappan, 1964, Sarcodunam chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology, Part C, Protista 2. Geological Society of America and University of Kansas Press.
Spirocyclinidae
Loeblich & Tappan 1988, Foraminiferal general and their classification, in GSI e-book. * Foraminifera morphological classificatio

{{Taxonbar, from=Q10911908 Loftusiida Foraminifera families Prehistoric SAR supergroup families