Permian-Triassic scolecodonts and conodonts from the Svalis Dome, central Barents Sea, Norway

Scolecodonts and conodonts are described from five samples of three cores f rom the Svalis Dome, central Barents Sea. The conodont species Mesogondolel la rosenkrantzi and Neospathodus svalbardensis confirm latest Permian (Dzul fian) and earliest Triassic (Dienerian) ages for the investigated intervals . Correlation with adjacent conodont distribution indicates a shorter depos itional gap in the late Permian than is evident on Svalbard. The conodont e lements show little thermal alteration with CAI (colour alteration index) v alues between 1.0 and 1.5 indicating a maximum burial temperature of 50-90 degreesC. The scolecodonts described herein have important evolutionary and distribution implications for polychaetes: the order Eunicida shows a rich er diversification in the Permian than previously known; the family Paulini tidae survived at least until the Late Permian; the family Hartmaniellidae diversified already in the late Palaeozoic; some forms are considered as re presentatives of unknown species and genera; the order Phyllodocida origina ted already in the latest Palaeozoic.