Geinitzina

Geinitzina is a genus of Foraminifera (Protista[1] or Protozoa[2]) from the early Carboniferous (late Mississippian to the late Permian that may have extended into the Triassic. Chambers are uniserial, arranged in a single row, or line. Test wall is double layered. The outer layer is of hyaline radial calcite, and is light in color. The inner layer is of microgranular calcite, and is dark is color. Both layers are secreted by the protoplasm.

Geinitzina Temporal range: Late Mississippian - Permian, ?Triassic
Scientific classification
Domain:	Eukaryota
(unranked):	SAR
(unranked):	Rhizaria
Phylum:	Retaria
Class:	Foraminifera
Order:	Fusulinida
Superfamily:	Geinitzinacea
Family:	Geinitzinidae
Genus:	Geinitzina Spandel, 1901

Geinitzina is included in the Fusulinida (Loeblich & Tappan, 1984, 1988) on the basis of test wall composition, in having a secreted microgranular layer.

References

1. Sen Gupta, 1999. Modern Foraminifera
2. Foraminiferida: Kingdom Protozoa. GBIF data portal as of 9Mar2013.

Further reading

• A. R. Loeblich and H. Tappan. 1984. Suprageneric classification of the Foraminiferida (Protozoa). Micropaleontology 30(1):1-70
• __ __ 1988.* Forminiferal Genera and their Classification. E-book
• Geinitzina in The Paleobiology Database.
• Krainer, Karl; Vachard, Daniel; Lucas, Spencer G. (March 2009). "Facies, Microfossils (Smaller Foraminifers, Calcareous Algae) and Biostratigraphy of the Hueco Group, Dona Ana Mountains, Southern New Mexico, USA". Rivista Italiana di Paleontologia e Stratigrafia. 115 (1): 3–26.