I am studying brachiopods and have encountered many specimens from the Russian Platform, such as choperella. After reading the treatise on it, there is very little description of its internal structure. I saw its source is ". 1969a. Novye Devonskie brakhiopody
tsentral’nykh i zapadnykh raionov Russkoi Platformy
[New Devonian brachiopods from the central and
western areas of the Russian Platform]. Ministerstvo
Geologii ... >>>