Upper Carboniferous and Permian mesolobid chonetacean brachiopods of Karavanke Mountains (Yugoslavia) and Carnian AIps (Italy)

Abstract

In the preface the definition of terms mesolobid and mesolobidity is given. In Gzhelian of the Karavanke Mountains two distinct forms of ribbed mesolobid chonetacean brachiopods were found in stratigraphically the same beds. This fact gives evidence for parallel evolution of two ribbed mesolobid chonetacean stocks. One of them is genus Paramesolobus Afanasjeva, 1975, the other Capillomesolobus n. gen. Both genera are also present in the same beds of Kasimovian of the Carnian Alps. The stratigraphical distribution of mesolobid chonetacean genera and species on world scale is given. Paleobiogeography and migration of genus Capillomesolobus is outlined. New taxa are Capillomesolobinae n. subfam., Capillomesolobus karavankensis n. gen., n. sp. (Karavanke Mountains, Gzhelian), C. pontebbanus n. gen., n. sp. (Carnian Alps, Corona Formation, Kasimovian) and C. heritschi n. gen., n. sp. (Karavanke Mountains, Trogkofel beds, Sakmarian or Artinskian).