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Base of the evolutionary tree for
Plesiosauria
← parent
Plesiosauria
(68 species)
Plesiosauroidea
→
(43 species)
unnamed group 1321
→
(42 species)
unnamed group 1329
→
(34 species)
Cryptoclidia
→
(33 species)
Plesiopterys
Microcleididae
→
(6 species)
unnamed group 1326
→
(4 species)
Eretmosaurus rugosus
Westphaliasaurus simonsensii
Westphaliasaurus
Eretmosaurus
Plesiosaurus
Pliosauridae
→
(12 species)
unnamed group 1310
→
(11 species)
unnamed group 1311
→
(10 species)
unnamed group 1312
→
(9 species)
Attenborosaurus
Hauffiosaurus
Thalassiodracon
Rhomaleosauridae
→
(11 species)
unnamed group 1298
→
(10 species)
unnamed group 1299
→
(9 species)
unnamed group 1300
→
(8 species)
Avalonnectes arturi
Macroplata tenuiceps
Stratesaurus taylori
Eoplesiosaurus
Stratesaurus
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