Radiodonta

Radiodonta is a subclass of mammals that includes the order Rodentia, which is characterized by their continuously growing incisors. This subclass is named for the presence of a radio, or gap, between the upper and lower incisors in the dentition. Radiodonta is further divided into two infraorders: Myomorpha and Hystricomorpha. Myomorpha includes rodents such as mice, rats, and squirrels, while Hystricomorpha includes porcupines, guinea pigs, and chinchillas. The subclass Radiodonta is one of the most diverse and successful groups of mammals, with over 2,200 species. They are found on every continent except Antarctica and are known for their adaptability to a wide range of environments. Radiodonta is an important group in ecology and conservation, as many species play crucial roles in their ecosystems and are threatened by habitat loss and other human activities.