Carterina

Carterina
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	SAR
Phylum:	Retaria
Subphylum:	Foraminifera
Class:	Globothalamea
Order:	Lituolida
Family:	Trochamminidae
Subfamily:	Carterininae Loeblich & Tappan, 1964
Genus:	Carterina Brady, 1884
Type species
Carterina spiculotesta (Carter, 1877) Brady, 1884

Carterina is a genus in the family Trochamminidae, composing its own subfamily Carterininae. The genus is described from specimens gathered during the Challenger expedition's circumnavigation of the Earth from 1872-1876.[1]

The test (or shell) of Carterina begins as a low, free, umbilicate trochospiral (concavo-convexly coiled with a central depression) in the early growth stage, becoming attached and spreading irregularly in later stages. Chambers become partially subdivided by secondary septa, reaching as many a 15 per chamber in later chambers.(Loeblich & Tappan 1964, 1988) Walls are composed of two sizes of fusiform spicules of low-Mg calcite, larger structural spicules in a ground mass of smaller spicules. The spicules are secreted by the protoplasm, crystallographic c-axes parallel to the elongation, and set parallel to the test surface.

Carterina is known from the Eocene of Spain and is widespread in shallow tropical waters in the Holocene, but is unknown from intervening epochs.

Carterina was previously included in the Geological Society of America's Treatise on Invertebrate Paleontology part C. in the Rotaliida as the superfamily Carterinacea.

References

1. "Foraminifera in Brady HMS Challenger Collection".

Further reading

• Deutsch, Susan; Lipps, Jere H (1976). "Test Structure of the Foraminifer Carterina". Journal of Paleontology. 50 (2): 312–7. JSTOR 1303500.
• Hansen, Hans; Grølund, Hans (August 1977). "Carterina: its morphology, structure, and taxonomic position" (PDF). Bulletin of the Geological Society of Denmark. 26 (1–2): 147–154. doi:10.37570/bgsd-1977-26-11. Retrieved 4 February 2015.
• Lana, C.C.; Sen Gupta, B.K (February 2, 2001). "Cretaceous Carterina (Foraminifera)". Marine Micropaleontology. 41 (1–2): 97–102. Bibcode:2001MarMP..41...97L. doi:10.1016/S0377-8398(00)00050-5.
• Loeblich, Alfred R.; Tappan, Helen (1964). Moore, R.C. (ed.). Protista 2: Sarcodina Chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology. Vol. C (5th ed.). Geological Society of America. ISBN 978-0-8137-3003-5.
• Loeblich, Jr, Alfred R.; Tappan, Helen (1988). Foraminiferal genera and their classification. New York: Van Nostrand Reinhold. ISBN 9780442259372.