What are the two main groups of Marginocephalia?
There are two main clades of marginocephalians: thick-skulled Pachycephalosauria (“thick headed lizards”) and beaked (and later frilled (and eventually horned)) Ceratopsia (“horned faces”).
Are Marginocephalia Ornithischians?
Marginocephalia is one of three major groups of the Ornithischia, or “bird-hipped” dinosaurs.
Is pachycephalosaurus a Marginocephalia?
Primitive marginocephalians are found in Asia, but the group migrated upwards into North America….Marginocephalia.
| Marginocephalians Temporal range: Late Jurassic–Late Cretaceous, | |
|---|---|
| Skull of Pachycephalosaurus wyomingensis | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
Did Marginocephalia have cheek teeth?
Its skull was 6 feet (1.8) long from beak to frill. It had a small frill on its head with a single nose horn that pointed upwards and two smaller horns over the eyes. The short snout ended in a parrot-like, toothless beak, but Monoclonius also had many cheek teeth.
What is diagnostic character of Marginocephalia?
Marginocephalia can be identified or possess diagnostic characters as the ridge/shelf life bone running crossways towards the back of the skull. They also possess dome-like heads in utmost cases.
Where was Marginocephalia restricted to during the Cretaceous period?
Although marginocephalians come in many shapes and sizes, they were restricted to the Northern Hemisphere during the Cretaceous Period.
Did all Ceratopsians have horns?
Ceratopsians are the Rhinos of the dinosaur world – large, plant eating and horned. All ceratopsians have a “beak” and at least the beginning of a frill. Later forms also had the well-known horns.
Did Marginocephalia have cheek teeth quizlet?
They had cheek teeth which implies chewing, but their teeth were irregular and not like a herbivore. No Gastroliths were ever found. Why did researchers think that Stegosaurus had a second brain and where was it located?
Which dinosaur has the nickname sheep of the Cretaceous?
Protoceratops
| Protoceratops Temporal range: Late Cretaceous, ~ | |
|---|---|
| Mounted P. andrewsi skeleton, Wyoming Dinosaur Center | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
Where was Marginocephalia restricted to during the Cretaceous period quizlet?
Do all ceratopsians have horns?
What dinosaur was the earliest ornithischian dinosaur?
Ornithischia (/ˌɔːrnəˈθɪski. ə/) is an extinct order of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds….Ornithischia.
| Ornithischians Temporal range: Early Jurassic–Late Cretaceous, (Possible Triassic record) | |
|---|---|
| Clade: | Dinosauria |
| Order: | †Ornithischia Seeley, 1888 [Madzia et al.] |