ancient predecessor

https://duckduckgo.com/?q=%22ekatantri%22&t=ffcm&atb=v204-6&iar=images&iax=images&ia=imageshttps://duckduckgo.com/?q=%22Ektantri+Veena%22&t=ffcm&atb=v204-6&iax=images&ia=images&iai=http%3A%2F%2F3.bp.blogspot.com%2F_DC_015ucniI%2FSiX_DBNjdoI%2FAAAAAAAAAB4%2FHo8eosEacMM%2Fs320%2Fbody%2Bwith%2Bveena.gif
https://www.indianetzone.com/52/ekatantri.htm.

http://www.rudravina.com/html_gb/divr_01.html#e

not to be confused with ektara https://beta.musicbrainz.org/instrument/ba30c0de-373c-44e4-ac28-594c4f316ab0 (gopichant)
or the ektar https://beta.musicbrainz.org/instrument/b0edfd1a-e728-4b93-802e-96c1c2f9d84a (tumbi)