A pelagic myodocopid ostracod from the Silurian of Arctic Russia
- 1Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
- 2CASP, Cambridge University, 18a Huntingdon Road, Cambridge CB3 0DH, UK
- 3Museum of Evolution, Uppsala University, Norbyvägen 16, 752 36, Uppsala, Sweden
Keywords: myodocope ostracods, Late Silurian, Arctic Russia, biostratigraphy, palaeobiogeography
Abstract. The Silurian myodocope ostracod Richteria migrans is reported from Arctic Russia, from Kotel’ny Island (New Siberian Islands) and the Taimyr Peninsula in strata of Ludfordian (late Ludlow, Late Silurian) age. These occurrences extend the biogeographical range of R. migrans from tropical to mid latitudes of the Early Palaeozoic Rheic Ocean in the palaeo-Southern Hemisphere, into subtropical regions of the palaeo-Northern Hemisphere on, or adjacent to, the Siberia Palaeocontinent. The new records reinforce the idea that R. migrans had wide dispersal capacity and probably possessed a pelagic lifestyle. It also endorses the use of R. migrans as a biostratigraphical marker fossil for the Ludfordian Stage, Ludlow Series, Upper Silurian.