original description
(of Adacna protracta Eichwald, 1841) Eichwald, E. 1841. Fauna Caspio-Caucasia, nonnullis observationibus novis illustravit. Petersburg, 1841, v + 290 pp., 40 pls., available online at https://www.biodiversitylibrary.org/page/33163056 [details]
basis of record
Nevesskaja, L.A. (2007). History of the genus <i>Didacna</i> (Bivalvia: Cardiidae). <em>Paleontological Journal.</em> 41(9): 861-949.
page(s): 938, pl. 22, figs. 4-13 [details] Available for editors [request]
From editor or global species database
Distribution Prikaspiiskaya Lowland, Lower Khvalynian Subhorizon. Recent Caspian Sea, mostly
its middle and southern regions [details]