Fusulinida

Fusulinida Temporal range:
Scientific classification
Domain:	Eukaryota
Clade:	Sar
Clade:	Rhizaria
Phylum:	Foraminifera
Class:	Globothalamea (?)
Order:	†Fusulinida Fursenko, 1958
Superfamilies
Archaediscoidea Colanielloidea Earlandioidea Endothyroidea Fusulinoidea Geinitzinoidea Moravamminoidea Nodosinelloidea Palaeotextularioidea Parathuramminoidea Ptychocladioidea Tetrataxoidea Tournayelloidea

Fusulinid limestone, Upper Pennsylvanian; Elk County, Kansas. Field of view is 3.9 cm wide. Link at source to view of entire slab.

The Fusulinida is an extinct order within the Foraminifera in which the tests are traditionally considered to have been composed of microgranular calcite. Like all forams, they were single-celled organisms. In advanced forms the test wall was differentiated into two or more layers. Loeblich and Tappan, 1988, gives a range from the Lower Silurian to the Upper Permian, with the fusulinid foraminifera going extinct with the Permian–Triassic extinction event. While the latter is true, a more supported projected timespan is from the Mid-Carboniferous period.