It depends on what size "group" one is talking about. There were two big groups, the Ornithischians, whose members had hips like those of modern birds, and the Saurischians, whose hips were more lived those of lizards.
Within these two groups, there were smaller, but still pretty populous, groups of Theropods, Sauromorphopods, Stegosaurs, Ankylosaurs, Ceratopsians, Hadrosaurs, Pachycephosaurs, Dromaeosaurs, Ornithomimi, and probably others that haven't been discovered.
The smaller groups are the Genera, and these are the names you know: Apatosaurus, Tyrannosaurus, Triceratops, etc.
Yes There is the bird-hipped dinosaurs and the reptile or lizard-hipped dinosaurs. These were further subdivided into smaller groups.
There are about 2000 different species of dinosaurs http://www.dinosaurfact.net
What dinosaurs? They came in VERY different sizes.
Most dinosaurs were herbivores. The main groups of herbivorous dinosaurs are hadrosaurs, sauropods, ceratopsians, stegosaurs, ankylosaurs, and pachycephalosaurs.
1500
Some dinosaurs traveled in groups, and some were more solitary.
In cretaceous period there were many different dinosaurs there were 67 different type's.
We do not know the total number of dinosaurs that existed, as many have not been discovered. Currently, there are 500 known genera and 1,000 different species.
Ornithischia and Saurischia.
To date, about 600, but it is estimated that there were about 1400+ dinosaurs.
There are 6 groups.
The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.The Roman empire was diverse because it encompassed many different ethnic groups of people and many different cultures and gods.