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The stratigraphical significance, evolutionary pathways and distribution patterns of Devonian (with emphasis on Middle Devonian) ostracods occurring in western Canada are reviewed. The overall faunal appearance is Devonian in aspect. Typical Eifelian-Givetian markers are ascertainable at the generic level, and occasionally resemble known species. Recognised genera mostly comprise cosmopolitan forms...
With respect to Middle Devonian ostracods from western Canada, special cases of palaeocopine extradomiciliar dimorphism are discussed, as in the opinion of many workers are unusual for younger hollinoideans and, in particular, primitiopsoideans. Although the general view that velar dimorphism is the main characteristic of Mid Palaeozoic Palaeocopina is basically not wrong, dimorphic histial structures,...
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