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Coturnix is a genus of five extant species and five to eight known extinct species of Old World quail.

1/ Rain quail or black-breasted quail ( Cay Ấn Độ or Cút mưa, Coturnix coromandelica)
2/ Japanese quail (Cay Nhật Bản, Coturnix japonica)

Synoicus is a genus of 4 species of Old World quail.
Two of the four species in the genus were originally classified in Excalfactoria, one was classified in Anurophasis, and one was classified in Coturnix. 

1/ King quail (Cay Trung Quốc, Synoicus chinensis), also known as the blue-breasted quail, Asian blue quail, Chinese painted quail, or Chung-Chi
The species has had a complex taxonomic history, being classified into the genus Coturnix, then Synoicus, then Excalfactoria. Phylogenetic evidence supports it belonging in an expanded Synoicus.