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These sponges had cylindrically shaped walls, with a typical diameter of 2 cm, with a small platform at the top, showing the position of the Osculum. Many species, such as Peronidella furcata, pictured, were colonial, however several solitary species are known.
These sponges are relatively abundant in European chalks
- Imanov. M., Hrdlickova., S., and Gregorova., R., (2005), The Complete Encyclopedia of Fossils, 3rd ed, Lisse: Rebo International, b.v., page 40
- Fossilworks, http://fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=3689, accessed 13th January 2014
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