basis of recordMazaev A.V. (2016). A new species of the genus <i>Medfracaulus</i> from the Upper Carboniferous of the Moscow Basin; Morphology and taxonomy and the family Ptychocaulidae (Gastropoda). <em>Paleontologicheskii Zhurnal.</em> 2016(3): 14-20., available online athttps://link.springer.com/content/pdf/10.1134/S0031030116010068.pdf?pdf=button[details]