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Saurischia
Temporal range: Late Triassic – Present
SaurischiaInfobox.png
Several species of Saurischian Dinosaur
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Saurischia
Seeley, 1888
Subgroups

Saurischia, meaning 'lizard hip joint' in Greek, is one of two classification orders used to distinguish and classify dinosaurs, the other being Ornithoscelida The name is derived from the method used to classify the animals, as dinosaurs classified under the saurischia branch are done so because they retain the ancestral bone configuration within their hips. All sauropodomorphs, one of the two great lineages of herbivorous dinosaurs, are saurischians as well as herrerasaurids.

Characteristics

The diversion between the two orders of dinosaurs developed in the late Triassic Period.

Classification

While the saurischia/ornithischia classification system is generally accepted among scholars and paleontologists, there does exist a minority theority proposed by paleontologist Robert Bakker that suggests classifying the theropods alone in their own order, while grouping the sauropodomorphs along with the ornithischians in the second order. In effect, grouping the carnivorous dinosaurs together, and the herbivorous dinosaurs together in a seperate order. This classification system identifies the carnivorous group as Theropoda, while classifying the herbivorous dinosaurs as either Phytodinosauria, or "plant dinosaurs", as suggested by Bakker, or as Ornithischiformes.

A 2017 study shows that saurischia is now paired up with ornithoscelida.

Taxonomy

Phylogeny

 Saurischia 

 Herrerasauria



 ? Eoraptor


 Sauropodomorpha 

 Saturnalia



 ? Thecodontosauridae



 Prosauropoda



 Sauropoda



 Theropoda 

 Ceratosauria (incl. Coelophysoidea)


 Tetanurae 

 Spinosauroidea


 Avetheropoda 

 Carnosauria 



 Coelurosauria