Koken E. (1897). Die Gastropoden des baltischen Untersilurs. <em>Bulletin de l'Académie Impériale des Sciences de St Petersburg.</em> 7(2): 97–214., available online athttps://www.biodiversitylibrary.org/page/30245854 page(s): 198-199, fig. 38 [details]
original descriptionKoken E. (1897). Die Gastropoden des baltischen Untersilurs. <em>Bulletin de l'Académie Impériale des Sciences de St Petersburg.</em> 7(2): 97–214., available online athttps://www.biodiversitylibrary.org/page/30245854 page(s): 198-199, fig. 38 [details]
basis of recordPeel, J. S. (2020). The Dala thumb: shell morphology and failed predation in<i>Pollicina cyathina</i>(Gastropoda) from the Ordovician of Dalarna, Sweden. <em>GFF.</em> 142(2): 139-146., available online athttps://doi.org/10.1080/11035897.2020.1728374[details]
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