1. They are in the family Muridae, in the order Rodentia . 2. Porcupines are distributed into two evolutionary independent groups within the suborder Hystricomorpha of Rodentia . 3. Also depicted are Rodentia 's Space Rangers. 4. The rodent clade corresponds to the order Rodentia , and insects to the class Insecta. 5. Rodentia is the most diverse mammalian family.6. In fact, groundhogs are the largest member of the squirrel family, Sciuridae, in the order Rodentia . 7. AFAIK, defining features of Rodentia are the particular anatomy and physiology of teeth, jaws, and palate. 8. Muridae is indeed a valid family in Rodentia : Myomorpha, and indeed the largest extant family of mammals. 9. A new species of " Rattus " ( Rodentia : Muridae ) from Manus Island, Papua New Guinea. 10. Mustelids ( weasel-like animals ) are a family in order Carnivora, and not part of order Rodentia .