ORNITHISCHIA


Dinosauria
      Herrerasauridae
      Saurischia
      ORNITHISHCHIA
            Fabrosauridae [Lesothosaurus]
            Genasauria
                  Thyreophora
                        Ankylosauria
                        Stegosauria
                  Cerapoda
                       Marginocephalia
                             Pachycephalosauria
                             Ceratopsia
                      Ornithopoda

ORNITHISCHIA [D&R p. 174]

Characters


copelvis.jpg (17222 bytes)

The Ornithischian pelvis.  Note the open acetabulum, the anterior (to the left) extension of the ilium, and the backward (to the right) extension of the pubis below and adjacent to the ischium.  Illustration from O. C. Marsh.  1896.  The dinosaurs of North America.  16th Annual Report, U.S. Geological Survey, pp. 133-244, 84 plates.


Included taxa


Pisanosaurus

Comment


Fabrosauridae

Distribution

Characters

Example


Genasauria  [D&R p. 174]

Characters

Included Taxa


THYREOPHORA [D&R p. 176]

Characters

Included taxa


Ankylosauria (?m.-u. Jurassic; Cretaceous)

Characters

Included taxa

Ankylosauridae

Characters

Examples

Nodosauridae

Characters

Examples


Stegosauria (middle Jurassic-late Cretaceous)

Characters


Kentrosauridae

Characters

Example


Stegosauridae

Characters

Examples

stego1.jpg (64465 bytes)

Illustration from O. C. Marsh.  1896.  The dinosaurs of North America.  16th Annual Report, U.S. Geological Survey, pp. 133-244, 84 plates.



Cerapoda

Characters

Ornithischia
Fabrosauridae
           Genasauria
        Thyreophora (Ankylosaurs and Stegosaurs)
                  CERAPODA
                Marginocephalia (Pachycephalosaurs and ceratopsians)
                Ornithopoda

MARGINOCEPHALIA

Characters

Included taxa


Pachycephalosauria (early-late Cretaceous) (web page by Nick Snells).

Characters

Examples


CERATOPSIA (early-late Cretaceous) [D&R p.176]

Characters

Included taxa


PSITTACOSAURIDAE

Psitticasaurus Early Cretaceous, Mongolia  (illustration by Shiraishi Mineo)

Characters


Neoceratopsia (Cretaceous)

Characters

Included taxa


Protoceratopsidae

Characters

Example


Ceratopsidae

Characters

Examples

 

ceratops3.gif (14413 bytes)

 

Illustration from O. C. Marsh.  1896.  The dinosaurs of North America.  16th Annual Report, U.S. Geological Survey, pp. 133-244, 84 plates.


Ornithischia
Fabrosauridae
           Genasauria
        Thyreophora (Ankylosaurs and Stegosaurs)
                  Cerapoda
                Marginocephalia (Pachycephalosaurs and ceratopsians)
                Ornithopoda

ORNITHOPODA     (earliest Jurassic-latest Cretaceous)

Characters

Included Taxa


HETERODONTOSAURIDAE   (early Jurassic)

Characters

Example

EUORNITHOPODA (Hypsilophodontidae plus Iguanodontidae plus Hadrosauridae)

Characters

HYPSILOPHIDONTIDAE (mid Jurassic-late Cretaceous)

Characters

Example


IGUANODONTIA

Characters

  1. Enlargement of the external nares
  2. Loss of premaxillary teeth

Iguanodontidae (middle Jurassic-late Cretaceous)

Iguanodon bernissartensis from the Cretaceous of Belgium.  Illustration from O. C. Marsh.  1896.  The dinosaurs of North America.  16th Annual Report, U.S. Geological Survey, pp. 133-244, 84 plates.

Characters

Example


HADROSAURIDAE (upper Cretaceous)

Characters

Classification

Hadrosaurinae

Examples

Lambeosaurinae

Character

Examples

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