|Members of the three families of squirrel-like rodents share the
same relatively unspecialised arrangement of jaw muscles:
Skulls and dentition
|The scuirognath skull is unspecialised.
The lateral masseter muscle extends in
front of the eye onto the snout and moves the lower jaw
forward during gnawing. The deep masseter muscle is short
and only serves to close the jaw.
The cheek teeth are simple - lacking cusps or enamel ridges. One of the two premolars is retained in each row, a primitive feature found only in sciurognaths.
The dental formula of the Grey Squirrel is I1/1; C 0/0; P3/2;M3/3.
These animals are represented in our Collections by the European red squirrel, the grey squirrel and the Eurasian beaver.