The growth and microstructure of deltidial covering plates of Lower and Middle Ordovician Clitambonitidines from Estonia and Leningrad Region are reviewed. In the genera Anchigonites, Antigonambonites, Vellamo, and Estlandia, ...
The study of Lower Kazanian terebratulids from the eastern Russian Platform displayed a well-pronounced homeomorphy. The examination of the inner shell morphology revealed a wide diversity of brachiopod species and genera. ...
The paper considers the first discovered larval shells of Rhynchonelliformea brachiopods from the Lower Ordovician of the Leningrad region Casts of larval shells on the pedicle and brachial valves are characterized by a ...