Geinitzinacea

{{Use dmy dates|date=September 2023}}

{{Short description|Superfamily of single-celled organisms}}

{{Taxobox

| fossil_range = {{Fossil range|Late Devonian|Late Permian}}

| image = Geinitzina fossils from the Permian.jpg

| image_caption = Geinitzina fossil from the Permian of Iran

| unranked_regnum = SAR

| unranked_subregnum = Rhizaria

| phylum = Granuloreticulosa

| classis = Foraminifera

| ordo = Fusulinida

| superfamilia = Geinitzinacea

| superfamilia_authority = Bozorgnia 1973

| subdivision_ranks = Families

| subdivision = See text

}}

The Geintizinacea comprises a superfamily of Upper Devonian to Upper Permian uniserial fusulinids (microgranular foraminifera with chambers aligned in a single row), the chamber walls consisting of a dark microgranular inner layer and radially fibrous outer layer. Advanced forms show secondary lateral thickening

The Geinitzinacea differs from the Nodosinellacea in that in the Nodosinellacea the inner layer is fibrous.

Two families are included, the Geinitzinidae and Pachyphloiidae.