Bykova, 1947 Discorbidae Upper Cretaceous Cenomanian Southern Siberian Mountains Bukhara Region Mjatliuk identified by scientist 1 / FEU-1010823 | (Reuss, 1844) Gavelinellidae Upper Cretaceous Turon Southern Siberian Mountains Bukhara Region Mjatliuk identified by scientist 2 / FEU-1010833 |