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Genus Comatula
- former usage synonymous with Antedon
Genus Holothuria
- type genus of the Holothuridae
Genus Lepus
- type genus of the Leporidae: hares
Genus Ochotona
- type genus of the Ochotonidae
Genus Mus
- type genus of the Muridae: common house mice; the tips of the upper incisors have a square notch
Genus Rattus
- common house rats; upper incisors have a beveled edge