†Veryhachium concavum Piskun 1974

Piskun 1974. [Veryhachium from the Ordovician and Silurian of Brest Hollow.] Timofeev, B.V.[Ed]. [Microphytofossils of the Proterozoic and Early Palaeozoic of the USSR.], Nauka, Leningrad, 1974: 56-58. Chapter pagination: 15-20