Rodents and Lagomorphs. Rodents and Lagomorphs. Rodents are the most successful of all mammalian orders. The order contains at least 34 families, and more than 354 genera and 1685 species.
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Able to generate a great deal of force on jaw because of mechanical advantage: efficient right angle attachment of medial masseter on dentary.
This corresponds with a shift from less efficient temporalis and masseter lateralis to medialis.Zygomasseteric Specializaitons
Locomotor styles include:
Old Families squirrels in the neotropics, but no gliders?
Spalacidae: mole rats
Rhizomyidae: bamboo rats
Platacanthomyidae: spiny dormice
Leporids and Ochotonids
In the jackrabbit, the elbow is a lock-and-groove mechanism designed to minimize lateral mobility. Note also partial fusion of radius and ulna.