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The two lowermost Darriwilian (Middle Ordovician) brachiopod species that were previously included in the genus Cyrtonotella are re-studied and compared with the type species Cyrtonotella semicircularis (Eichwald) from the St Petersburg Region. Based on the new data the classification of the important group of orthids, widely distributed in the Sandbian Kukruse to Keila regional stages in the East Baltic, is improved. The lower Darriwilian specimens, previously considered to be Cyrtonotelladoi:10.3176/earth.2014.05 fatcat:pqy2wpzpejfddphtdvhvvuqhae