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
Fossil Geinitzina Postcarbonica from the Permian Period, Rote Formation, Iran
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.