Figure 2.

Phylogeny and stratigraphic record of (filled circle) Plesiosauria illustrating relationships among (filled square) pliosauroids including Umoonasaurus (see electronic supplementary material). Umoonasaurus and taxa exhibiting the ‘pliosauromorph’ body plan (Rhomaleosaurus, Simolestes, Pliosauridae) are indicated by icons. Boxed numbers for selected nodes denoting (open circle) Rhomaleosauridae and (open diamond) advanced rhomaleosaurid taxa refer to synapomorphies discussed in the main text. Other numbers refer to bootstrap/Bremer support.