A new species of the genus Medfracaulus from the Upper Carboniferous of the Moscow Basin; Morphology and taxonomy and the family Ptychocaulidae (Gastropoda)

详细

The latest representative of the family Ptychocaulidae, Medfracaulus sinelnikovae sp. nov., is described from the Moscovian Stage of the Moscow Basin. Morphology of Ptychocaulidae, their taxonomy and distribution are discussed, and the species composition of the genus Medfracaulus is considered.