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Base of the evolutionary tree for
Plesiosauroidea
← parent
Plesiosauroidea
(43 species)
unnamed group 1188
→
(42 species)
unnamed group 1196
→
(34 species)
Cryptoclidia
→
(33 species)
Xenopsaria
→
(29 species)
Cryptoclididae
→
(4 species)
Plesiopterys
Microcleididae
→
(6 species)
unnamed group 1191
→
(4 species)
unnamed group 1192
→
(3 species)
Seeleyosaurus guilelmiimperatoris
Westphaliasaurus simonsensii
Eretmosaurus rugosus
Westphaliasaurus
Eretmosaurus
Plesiosaurus
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