What characteristic defines the Suborder Marginocephalia?
Answer
A distinctive shelf of bone extending over the back of the skull
The Suborder Marginocephalia is a grouping that encompasses both the ceratopsians, like *Xenoceratops*, and the pachycephalosaurs (the bone-heads). This group is characterized by a specific feature relating to the back of the skull. This defining characteristic is the presence of a distinctive shelf of bone, known as the frill or an incipient frill structure, that extends posteriorly over the neck region from the parietal bone. This anatomical feature unites these otherwise distinct dinosaur groups within the Linnaean hierarchy, placing them above the Order Ornithischia.
Related Questions
To which subfamily is the genus *Xenoceratops* assigned?Where were the remains of *Xenoceratops* formally described from?What does the genus name *Xenoceratops* translate to roughly?Who established the genus *Xenoceratops* in 2012?Which individual does the specific epithet *urmani* honor?Which Order defines *Xenoceratops* as "bird-hipped"?Which subfamily does the famous *Triceratops* belong to?What feature characterizes *Xenoceratops*'s parietal ornamentation?What justifies assigning *Xenoceratops* its own genus?What evolutionary concept does *Xenoceratops*'s ornamentation suggest?What characteristic defines the Suborder Marginocephalia?