Svetovosotkova, 1953 Spirillinidae Upper Jurassic Oxfordian East European Platform Saratov Oblast Mjatliuk identified by scientist 1 / FEU-1010809 | Dain, 1948 Discorbidae Middle Jurassic Callovian East European Platform Saratov Oblast Mjatliuk identified by scientist 2 / FEU-1010814 |