Classification of Dinosaurs

An article explaining the classification of dinosaurs.
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
Dinosaurs (178)

Dinosaurs (“terrible lizards”) belong to a large group of reptiles called Archosauria (“ruling reptiles”). They are classified into two distinct orders, which are distinguished by their pelvic differences.

Saurischia (“lizard hipped”). All members of this order had modern lizardlike pelvises and clawed feet. Saurischians roamed Earth from the Middle Triassic to the end of the Cretaceous period. They included carnivores and plant eaters.Members of the order included Allosaurus (“different lizard”), Apatosaurus (“deceptive lizard”), which was formerly called Brontosaurus, and Tyrannosaurus (“tyrant lizard”). The group is divided into two suborders: Theropoda (“beast footed”) and Sauropodomorpha (“lizard-footed forms”). The Velociraptor (“swift robber”) was a theropod.

Ornithiscia (“bird hipped”). All Ornithischian dinosaurs had pelvises similar to those of modern birds, and hoofed toes. All were herbivores. These dinosaurs lived throughout the world from the Middle Triassic to the end of the Cretaceousperiod. Members of the order included Iguanodon (“iguana tooth”), Stegosaurus (“plated lizard”), and Triceratops (“three-horned face”). The order is divided into four suborders: Ornithopoda (“bird footed”), Stegosauria (“plated lizards”), Ankylosauria (“armored lizards”), and Certopsia (“horned faces”).


Provided by Infoplease—an authoritative, comprehensive reference website that offers an encyclopedia, a dictionary, an atlas, and several almanacs. Visit to find more resources endorsed by teachers and librarians.

Your Free Gift

Take Back Your Evenings: Top 5 Strategies for Work/Life Balance

It can be difficult to have a life outside of school when you let the demands of teaching take over every moment of your day. This workbook includes the top 5 strategies to help you take back your evenings while still being a great teacher.

Start a free trial today to get your work/life balance strategies workbook absolutely free (a $19.99 value)!


take your evenings back workbook


Special Offer: Get 50% off unlimited, ad-free access

Use special offer code 2020 at checkout to get half off a premium membership of full access and unlimited downloads.

Get Started

Select from a monthly, annual, or 2-year membership plan. All plans include a 7-day trial. Cancel anytime.
Learn more about Premium