COSTAYELLA Conil and Lys, 1977
Type species: Tournayella costata
Lipina, 1955 (*1863),
p. 36; OD.
Thurnayella (Costayella) Conil and Lys. 1977 ( *667), p. 17.
Test with tubular enrolled test, streptospiral in the early stage, later planispiral, later part with indentations of the wall to form pseudo-chambers, basal supplementary deposits forming nodosities or projections opposite the constriction; wall calcareous, microgranular, thin, dark, and undifferentiated; aperture basal, simple. L. Carboniferous (Tournaisian to Visean); USSR: Urals, Russian platform.