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A new Ordovician astylospongiid sponge (Porifera) as an erratic from Baltica

Published online by Cambridge University Press:  01 April 2016

F. Rhebergen*
Affiliation:
Slenerbrink 178, 7812 HJ Emmen, The Netherlands. E-mail:, freek.rhebergen@planet.nl
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Abstract

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Until now hemispherical astylospongiid sponges were invariably referred to as Caryospongia juglans var. basiplana Rauff. Renewed investigations have now shown that part of the material should be assigned to a new genus and species, Tympanospongia vankempeni, which is characterised by a system of very irregular canals. These flat-based sponges originate from the Baltic region and occur in two assemblages of silicified Late Ordovician sponges known exclusively as erratics from The Netherlands and northern Germany. These fossils were transported by the River Eridanos, a former drainage system from the Baltic region that filled the North European Basin during the Miocene to Early Pleistocene. Specimens of Tympanospongia vankempeni gen. et sp. nov. also occur in the Upper Pleistocene of Gotland, Sweden. The new sponge described herein principally differs from other genera of the Astylospongiidae found frequently in the erratic sponge assemblages by its irregular system of apochetes which ramify and anastomose commonly.

Type
Research Article
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2004

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