Spirocyclina

Spirocyclina
Temporal range: Late Cretaceous (Santonian)
Scientific classification Edit this classification
Domain: Eukaryota
Clade: Sar
Clade: Rhizaria
Phylum: Retaria
Subphylum: Foraminifera
Class: Globothalamea
Order: Loftusiida
Family: †Spirocyclinidae
Genus: †Spirocyclina
Munier-Chalmas, 1887

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 about 25 strongly arcuate chambers. Composition is of agglutinated matter, the outer layer of the wall imperforate. Chambers are subdivided into secondary chamberlets by internal structures. The aperture consists of a double row of pores on the apertural face. Anchispirocyclina and Martiguesia are among related genera.

References

  • Alfred R. Loeblich, jr & Helen Tappan 1964. Sarcodina, Chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology, Part C, Protista 2. Geological Society of America and University of Kansas Press.
  • A.R. Loeblich & H Tappan, 1988 in GSI.ir Paleontology. [1]
  • Rotaliata, Textulariana [2]

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