rodent taxonomy

Factual Questions
1

I was watching TV and that blockbuster commercial with the cgi rabbit and guinea pig came on. It got me wondering: I know rabits are lagomorphs, but are lagomorphs rodents or a separate group on the same level?

2

Lagomorphs are an order, and therefore on the same taxonomic level as the order Rodentia (in which they were formerly included).

3

Rodents are not part of the lagomorph family, IIRC.

4

Lagormorpha (hares, rabbits and pikas) and Rodentia (rodents) are sister groups, which together make up the clade (a group descended from a common ancestor) Glires. Under the Linnaean classification scheme, both are Orders.

5

This site gives the origin of rodents, the distinction between them and Lagomorpha, and notes “Grandorder Anagalida” as synonymous with Glires. The University of Michigan Animal Diversity site has a page listing the characteristics shared by rodents and links to each of the 29 families of Rodents.