Originally published as 'comb. nov.' being based on invalidly published species names: Thinnfeldia gracilis Prynada 1940, nom. nud. and Thinnfeldia gracilis Prynada ex Vladimirovich (in Ezegodnik Vsesoyuzn. Paleontol. Obshch. 17: 244. 1965), which lacking holotype designation (description in Russian provided only); Thinnfeldia distatntifolia Vladimirovich 1965, nom. inval. [lacking holotype designation when first published], was also permissibly cited into the synonymy of a new species.