Cettia is a genus of small insectivorous songbirds which make up the core of the family Cettiidae.

1/ Chestnut-headed tesia (Chích đuôi cụt bụng vàng, Cettia castaneocoronata)

The chestnut-headed tesia was formerly included in the genus. 
A molecular phylogenetic study published in 2011 found that the chestnut-headed tesia (Chích đuôi cụt bụng vàng) belongs to the genus Cettia, bush warbler. 
The species was moved but retained the same common name or sometimes referred to as Cettia castaneocoronata abadiei