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→Description: added detail
===''Saurischia''===
===''Saurischia''===
Herbivorous species were almost all quadrupedal. They carried peg-like teeth which cut, rather than chewed, plant material; grinding of food was aided by gastroliths. Carnivorous species were exclusively bipedal.
*Sauropoda
::Species of this infraorder are characterized by long necks and tails, barrel-shaped bodies, and column-like legs. In three families (notably Diplodocidae, Brachiosauridae, and Titanosauroidea) there are species which are of extreme size, in excess of 125 feet in length and 100 tons, making them the largest animals to have walked the earth.
:::''Apatosaurus''
:::''Brachiosaurus''
:::''Ultrasaurus''
:::''Seismosaurus''
:::''Argentinosaurus''
:::''Diplodocus''
===''Ornithischia''===
*Theropoda
::Exclusively bipedal; forearms meant for grasping or holding. Fossil evidence for several species indicate pack hunting.
:::''Coelophysis''
:::''Ornithomimus''
:::''Allosaurus''
:::''Tyrannosaurus''
:::''Deinonychus''
:::''Velociraptor''
:::''Giganotosaurus''
===''Ornithischia''===
Species of this group were all herbivorous; most were quadrupedal. Front teeth were lacking, while a predentary bone was present in the front of the lower jaw. Several species (mainly within ''Ceratopsia'') had a distinctive parrot-like beak.
*Ceratopsia
::Species of this infraorder carried one or more horns on their heads, as well as a shield-like frill to protect the neck.
:::''Triceratops''
:::''Pachyrhinosaurus''
:::''Torosaurus''
:::''Protoceratops''
:::''Styracosaurus''
*Stegosauria
::Large dinosaurs with a row of bony plates on top of their backs, and several spikes used as a defensive weapon at the end of their tails.
:::''Stegosaurus''
:::''Huayangosaurus''
:::''Kentrosaurus''
*Ankylosauria
::Heavily-armored dinosaurs, some with a row of spikes along each side, and possessing a bony tail club.
:::''Ankylosaurus''
:::''Euoplocephalus''
:::''Edmontonia''
*Ornithopods
::Large, herd-dwelling dinosaurs that could run bipedaly. Several species had a "boss" of bone on their heads (Pachycephalosaurs) which may have been used for head-butting similar to bighorn sheep; others a crest of bone (hadrosaurs) which may have been sound resonators.
:::''Camptosaurus''
:::''Iguanodon''
:::''Pachycephalosaurus''
:::''Parasaurolophus''
:::''Edmontosaurus''
:::''Bactrosaurus''
:::''Maiasaura''
==Highlights of the history of dinosaur paleontology==
==Highlights of the history of dinosaur paleontology==