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An unusually large specimen of the rare digitate to bladed Aulocopella winnipegensis Rauff and three relatively normal sized specimens of ashtray-shaped Hudsonospongia? sp. constitute the first record of demosponges from the Upper Ordovician Beaverfoot Formation in southeastern British Columbia and the first record of these taxa from western Canada. Gross form and canal structure are well preserved, but dolomitization and (or) coarse microsphaeroidal silicification have obliterated spicules and other structural details. We interpret these sponges as epifaunal recliners, without means of attachment to the substrate, a life mode rarely encountered in the modern sponge biota.

canadian journal of earth sciences

An unusually large <i>Aulocopella winnipegensis</i> and associated demosponges from the Upper Ordovician Beaverfoot Formation, southeastern British Columbia

An unusually large Aulocopella winnipegensis and associated demosponges from the Upper Ordovician Beaverfoot Formation, southeastern British Columbia