Belongs within: Loeblichiidae.
Dainella is a genus of fusulinid Foraminifera from the lower Carboniferous with globular to nautiloid tests with walls not differentiated into layers (Cózar & Vachard 2001).
Characters (from Cózar & Vachard 2001): Globular to nautiloid tests, involute or partially evolute. Repetitive and abrupt changes of the coiling axis (60 to 90° between successive whorls). Numerous and close chambers, separated by inclined septa. Faint sutures. Supplementary formations are chomata, eventually strong. Wall dark, microgranular, undifferentiated. Aperture terminal, simple.
<==Dainella Brazhnikova 1962CV01 |--*D. chomatica (Dain in Brazhnikova 1962) (see below for synonymy)CV01 |--D. alborziensis Bozorgnia 1973CV01 |--D. angusta Vdovenko in Brazhnikova & Vdovenko 1973CV01 |--D. callosa Vdovenko in Brazhnikova & Vdovenko 1973CV01 |--D. cognata Ganelina 1966CV01 |--D. dainae (Chernysheva 1940)CV01 |--D. densaspira Bozorgnia 1973CV01 |--D. elegantula Brazhnikova 1962 (see below for synonymy)CV01 |--D. holkeriana Conil & Longerstaey in Conil et al. 1980CV01 |--D. libera Postoyalko 1970CV01 `--D. sichuanensis Ye et al. 1987CV01
*Dainella chomatica (Dain in Brazhnikova 1962) [=Endothyra chomatica; incl. D. chomatica f. magna Brazhnikova 1962, D. chomatica f. staffelloides Brazhnikova 1962]CV01
Dainella elegantula Brazhnikova 1962 [incl. D. elegantula f. compressa Brazhnikova & Vdovenko 1973 (n. n.), D. elegantula f. evoluta Brazhnikova 1962, D. elegantula f. ventrosa Brazhnikova 1962]CV01
*Type species of generic name indicated
References
[CV01] Cózar, P., & D. Vachard. 2001. Dainellinae subfam. nov. (Foraminiferida du Carbomifère inférieur), révision et nouveaux taxons. Geobios 34 (5): 505–526.
Loeblich, A. R., Jr & H. Tappan. 1964. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 2. The Geological Society of America and The University of Kansas Press.