CHUVASHIA REPUBLIC
PORETSKII DISTRICT
MENYA RIVER
LEFT TRIBUTARY OF THE SAURA RIVER
SPEETONICERAS VERISCOLOR ZONE
UPPER HAUTERIVIAN STAGE
UPPER NEOCOMIAN SUBEPOCH
MIDDLE EARLY CRETACEOUS EPOCH
EARLY EARLY CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1904
INFRACLASS: EURYAPSIDA COLBERT, 1945
SUPERORDER: SAUROPTERYGIA OWEN 1860
GRANDORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994
ORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835
SUBORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835
INFRAORDER: PLESIOSAUROMORPHA NOVA
EUPLESIOSAURIA O’KEEFE, 2001
Superfamily: CRYPTOCLEIDOIDEA Williston, 1925
TRICLEDIA O’KEEFE, 2001
Family: ARISTONECTIDAE O'KEEFE & STREET, 2009
*Abyssosaurus nataliae
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