Hi,
Sathatha or sathada srivaishana's are followers of Sri Ramanujam. Those don't wear 'Poonul' but they are belongs to sri vaishnavas. Sathada means not wearing in Tamil, because some of them have taken a decision not to wear 'Poonul' (means white thread wear across the chest) after a fight between vaishnavas.
Sathatha sri vaishnavas are spread all over south India. Some of them are still working as a priest in vaishnava temple.
Their main duty in ancient period is to perform puja and flower decoration in vaishana temples.
