EUROPEAN RUSSIA
TETYUSHI DISTRICT
RIGHT BANK OF THE VOLGA RIVER
VILLAGE OF IL’INSKOE
SYOMIN OVRAG RAVINE
NORTH DVINA HORIZON
UPER SUB STAGE
TATARINAN STAGE
LATE PERMIAN
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA
SUPERLEGION: NEODIAPSIDA BENTON, 1985
LEGION: ARCHOSAUROMORPHA HUENE, 1946
SUPERCOHORT: AVEMETATARSALIA BENTON, 1999
COHORT: PROLACERTIFORMES CAMP, 1945 NOVA
MAGNORDER: PROTOROSAURIA HUXLEY, 1871
Superfamily: PROTOROSAUROIDEA Lydekker, 1888 (sensu Kuhn, 1969)
Family: PROTOROSAURIDAE Lydekker, 1888
*Eorasaurus olsoni