The Fusulinidae is a family of
fusulinacea
The Fusulinacea is a superfamily in the Fusulinida in which the test is spherical, discoida, or fusiform; commonly coiled, less often uncoiling in the late stage, numerous chambers per whorl; test wall of microgranular calcite (as for the order) i ...
n
foraminifera
Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly ...
from the upper
Carboniferous (Lower
Pennsylvanian, Morrowan) to the Upper
Permian
The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last ...
(
Guadalupian
The Guadalupian is the second and middle series/epoch of the Permian. The Guadalupian was preceded by the Cisuralian and followed by the Lopingian. It is named after the Guadalupe Mountains of New Mexico and Texas, and dates between 272.95 ± ...
), tests of which are fusiform to subcylindrical with walls of two to four layers. Are planispirally coiled throughout or with early whorls at a distinct angle to the later plane of coiling. Septa, flat to well fluted; tunnel, single; chomata variable in development.
Taxonomy
The Fusulinidae is divided into the following subfamilies, ordered as in
Loeblich and
Tappan, 1988.
Fusulinellinae, Staff and Wedekind 1910.
Fusulinidae with flat or slightly fluted septa, wall of three or four layers including diaphanotheca and generally pronounced outer tectorium.
U Carb - U Permian (as for the family)
Fusulininae, Von Möller 1878
Fusulinidae in which the septa are moderately to strongly fluted, wall is composed of 2 to 4 layers including diaphanotheca, the outer tectoria is weakly developed or absent, and chomata or pseudochomata may be present. Upper Carboniferous - Lower Permian (Wolfcamian/Sakmarian)
Eofusulininae, Rauzer-Chernousova & Rosovskaya, 1959.
Early Fusulinidae from the Upper Carboniferous (
Moscovian), commonly with only three or four whorls, thin and weakly differentiated walls, inconsistent outer tectorium, prominent axial fillings and a possibility of chomata.
Wedekindellininae, F. Kahler & G Kahler, 1966
Middle and Upper Pennsylvanian ( U Carb) Fusulinidae; test fusiform; septa flat with little or no fluting; wall of 3 or 4 layers; chomata prominent.
References
*
* Alfred R. Loeblich Jr and Helen Tappan,1988. Forminiferal Genera and their Classification. Van Nostrand Reinhold. ''see'
Fusulinina-GSI
{{Taxonbar, from=Q5510367
Fusulinida
Foraminifera families
Prehistoric SAR supergroup families