Abstract
Adolfia siratschoica (Ljaschenko) and Adolfia krestovnikovi (Ljaschenko) are accepted as zonal species of the Petino and Voronezh Horizons of the Frasnian Stage of the Russian Platform. However it was established that these species do not belong to the genus Adolfia. The former species was recognized as the nomenclatural type species of Ljaschenkovia gen. nov. and the latter species was recognized as the type species of Tokmospirifer gen. nov. The comparative analysis provided of the shell structure, microornamentation, and shell interior of the type species of Ljaschenkovia gen. nov., Tokmospirifer brevis gen. et sp. nov., and Adolfia solita Ljaschenko is presented.
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