A revision of some British Lower Bajocian stephanoceratid ammonites |
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| Affiliation: | 1. Department of Physics and Astronomy & Centre for Planetary Science and Exploration, University of Western Ontario, London, Ontario N6A 3K7, Canada;2. Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada;1. University of Silesia, Faculty of Earth Sciences, Będzińska 60, PL-41-200 Sosnowiec, Poland;2. Geological Institute of Russian Academy of Sciences, Pyzhevski Lane 7, 119017 Moscow, Russia |
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| Abstract: | Members of the ammonite family Stephanoceratidae from the Middle Jurassic, Lower Bajocian, Laeviuscula to Humphriesianum zones of South West England are revised. These comprise faunas resulting from periodic migrations and possibly hybridization. The taxonomic positions of Teloceras Mascke, 1907, Kumatostephanus Buckman, 1922, Gibbistephanus Buckman, 1928 and Pseudoteloceras Pavia and Fernández-López, 2016 are considered in the light of new research. A new subfamily Kumatostephaninae is erected and hypotheses are presented regarding the evolution of some Early Bajocian stephanoceratids. Pseudoteloceras digbyi sp. nov. represents the earliest ‘Teloceras-like’ morphology from the late Sauzei Zone. Refinement is made of the scheme of faunal horizons for the Lower Bajocian. |
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| Keywords: | Ammonites Bajocian Stephanoceratids Dorset |
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