English: Drawing of an operculum of Bithynia bavelensis. Scale bar is 1 mm.
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Penkman K. E., Preece R. C., Bridgland D. R., Keen D. H., Meijer T., Parfitt S. A., White T. S. & Collins M. J. (2013). "An aminostratigraphy for the British Quaternary based on Bithynia opercula". Quaternary Science Reviews61: 111-134. doi:10.1016/j.quascirev.2012.10.046 Figure 3, cropped.
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{{Information |Description={{en|Drawing of an operculum of ''Bithynia bavelensis''. Scale bar is 1 mm.}} |Source=Penkman K. E., Preece R. C., Bridgland D. R., Keen D. H., Meijer T., Parfitt S. A., White T. S. & Collins M. J. (2013). "An aminostratigrap...