Uk

Gasparinisaura

Late Cretaceous

Argentina

Heterodontosaurus

Early Jurassic

South Africa

Hypsilophodon

Early Cretaceous

Western USA

Jeholosaurus

Early Cretaceous

China

Leaellynasaura

Early Cretaceous

Australia

Notohypsilophodon

Late Cretaceous

Argentina

Orodromeus

Late Cretaceous

Western USA

Othniela

Late Jurassic

Western USA

Parkosaurus

Late Cretaceous

Alberta, Canada

Thescelosaurus

Late Cretaceous

Western USA; Canada

Tsintaosaurus

Late Cretaceous

China

Yandusaurus

Middle Jurassic

China

Zephyrosaurus

Early Cretaceous

Western USA

Hadrosaurinae Lambeosaurinae

Hadrosaurinae Lambeosaurinae

Heterodontosauridae Marginocephalia

H Cerapoda + Ornithopoda = stem-based

O Marginocephalia = node-based

FIGURE 11.2 Cladogram for Ornithopoda, showing hypothesized relationships between Heterodontosauridae, Iguanodontia, and other ornithopods.

these are in Iguanodontia (Tables 11.1 and 11.2). "Hypsilophodontidae" is a grouping of ornithopods that was once considered as a clade within Euornitho-poda, but recent analyses reveal that it is probably polyphyletic. As a result, its former members are now placed within other clades under Euornithopoda.

Heterodontosauridae Marginocephalia

O Cerapoda Genasauria

Thyreophora

Euornithopoda

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