What is "rucervus"

Rucervus is a genus of deer from India, Nepal, Indochina, and the Chinese island of Hainan. They are threatened by habitat loss and hunting, and one species has already gone extinct.

They were previously thought to be members of the genus Cervus, but were moved to Rucervus based mainly on morphological differences. Based on genetic evidence, the Eld's deer should be moved back to Cervus, while the two last species remain in Rucervus or –less likely– could be moved to Axis.