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10.1144/SP295.3Geological Society of LondonGeological Society of London18813302712565091202407231009110024910.11442024-07-23T22:26:47Z2008-06-02T23:38:08Z7Geological Society, London, Special PublicationsSP0305-87192041-4927060220080120082951New eugeneodontid sharks from the Lower Triassic Sulphur Mountain Formation of Western CanadaRaoul J.MutterDepartment of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK (e-mail: )Andrew G.NeumanRoyal Tyrrell Museum of Palaeontology, P.O. Box, Drumheller, Alberta, T0J 0Y0, Canada (e-mail: )Abstract Eugeneodontid sharks, previously believed to have become virtually extinct during the great end-Permian extinction event, are here shown to be diverse in the Early Triassic of western Canada. Although the specimens are probably predominantly Olenekian in age, they show an abundance similar to that of the Late Permian of East Greenland. Similar in size and morphology to their Palaeozoic predecessors, this diverse assemblage is seen to have a short duration within the Early Triassic. A number of identifiable dentitions and postcranial skeletal remains suggest the presence of at least two caseodontid species (Caseodus varidentis sp. nov. andFadenia uroclasmato sp. nov.) and an edestoid (Paredestus bricircum gen. et sp. nov.) Many other specimens recovered from the Lower Triassic Vega-Phroso Siltstone Member (Sulphur Mountain Formation) at Wapiti Lake are too poorly preserved for identification but help demonstrate the major taxonomic problems in eugeneodontid systematics. 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