|Skull of Ptilodus|
Multituberculates are usually placed outside both the two main groups of living mammals, the Theria (placentals and marsupials), and monotremes. Some cladistic analyses put them closer to Theria than to monotremes.
The multituberculates had a head anatomy similar to rodents. They had cheek-teeth separated from the chisel-like front teeth by a wide tooth-less gap (called the diastema). Each cheek-tooth displayed several rows of small cusps (or tubercles, hence the name) which worked against similar rows in the teeth of the jaw. It was an efficient chopping device.
|Wikispecies has information on: Multituberculata.|
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