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.