ANTARCTICA

SEYMOUR ISLAND

ISLA MARAMBIO

LOPEZ DE BERTODANO FORMATION

UNIT "KLB 9"

PACHYDISCUS ULTIMUS BIOZONE

MAASTRICHTIAN STAGE

UPPER SENONIAN SUBEPOCH

GULF EPOCH

LATEST 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: ELASMOSAUROIDEA nova

Family: ELASMOSAURIDAE Cope, 1869

Aristonectes cf. parvidens

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ANTARCTICA

WEST ANTARCTICA

NORTHEAST PENINSULA

BELOW JAMES ROSS ISLAND

SEYMOUR ISLAND

LOPEZ DE BARTODANO FORMATION

MAASTRICHTIAN STAGE

UPPER SENONIAN SUBEPOCH

UPPER GULF EPOCH

LATE CRETACEOUS

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: AVES LINNAEUS, 1758

AVEBREVICAUDA PAUL, 2001

SUBCLASS: CARINATE MERREM, 1813

INFRACLASS: NEORNITHES GADOW, 1893

PARVCLASS: NEOGNATHAE PYCRAFT 1900

ORDER: GAVIIFORMES WETMORE & MILLER, 1926

Family: GAVIIDAE Allen, 1897

*Polarornis gregorii

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