Mjatliuk, 1953 Discorbidae Lower Cretaceous Barremian East European Platform Tatarstan Mjatliuk identified by scientist 1 / FEU-1010818 | ![]() | (Kuebler and Zwingli, 1870) Spirillinidae Middle Jurassic Callovian East European Platform Tatarstan Mjatliuk identified by scientist 2 / FEU-1010805 | ![]() |