SOUTH DAKOTA
MEADE COUNTY
BELLE FOURCHE RESERVOR
UPPER GREENHORN FORMATION
TURONIAN STAGE
UPPER GALLIC FORMATION
LOWER GULF EPOCH
LATE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1903
INFRACLASS: NEODIAPSIDA BENTON, 1985
LEGION: LEPIDOSAUROMORPHA BENTON, 1983
SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)
MAGNORDER: SQUAMATA, OPPEL, 1811
SUPERORDER: LACERTILIA OWEN, 1842
GRANDORDER: SCINCOGEKKONOMORPHA SUKHANOV, 1961
MICRORDER: SCINCOMORPHA CAMP, 1923
ORDER: ANGUIMORPHA FURBRINGER, 1900
SUBORDER: DIPLOGLOSSA COPE, 1864
INFRAORDER: THECAGLOSSA COPE, 1890
PARVORDER: MONSTERSAURIA NORELL & GAO, 1977
Superfamily: VARANOIDEA Gray, 1827 (sensu Camp, 1923)
Family: MOSASAURIDAE Gervais, 1853
Subfamily: AIGALOSAURIDAE Gorjanovic-Kramberger, 1892
Basal aigalosaurid grade
Gen. sp indet.
SOUTH DAKOTA
MEADE COUNTY
SDSM LOCALIYT F9413
LOWER POOL CREEK MEMBER
CARLILE SHALE
TURONIAN STAGE
UPPER GALLIC FORMATION
LOWER GULF EPOCH
LATE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1903
INFRACLASS: NEODIAPSIDA BENTON, 1985
LEGION: LEPIDOSAUROMORPHA BENTON, 1983
SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)
MAGNORDER: SQUAMATA, OPPEL, 1811
SUPERORDER: LACERTILIA OWEN, 1842
GRANDORDER: SCINCOGEKKONOMORPHA SUKHANOV, 1961
MICRORDER: SCINCOMORPHA CAMP, 1923
ORDER: ANGUIMORPHA FURBRINGER, 1900
SUBORDER: DIPLOGLOSSA COPE, 1864
INFRAORDER: THECAGLOSSA COPE, 1890
PARVORDER: MONSTERSAURIA NORELL & GAO, 1977
Superfamily: VARANOIDEA Gray, 1827 (sensu Camp, 1923)
Family: MOSASAURIDAE Gervais, 1853
Infrafamily: NATANIA
Subfamily: RUSSELLOSAURINAE Bell, 1993
Gen. sp indet.
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