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According to a 2008 review of the taxonomy, there are about 4,000 species of freshwater [[gastropod]]s (3,795–3,972).<ref name="Strong 2008"/>
As of 2023 there are known 5182 species of fossil freshwater gastropods.<ref>{{Cite journal |last=Neubauer |first=Thomas A. |date=2023-09-12 |title=The fossil record of freshwater Gastropoda – a global review |url=https://onlinelibrary.wiley.com/doi/10.1111/brv.13016 |journal=Biological Reviews |language=en |doi=10.1111/brv.13016 |issn=1464-7931}}</ref>
At least 33–38 independent [[Lineage (evolution)|lineages]] of gastropods have successfully colonized freshwater environments.<ref name="Strong 2011"/> It is not possible to quantify the exact number of these lineages yet, because they have yet to be clarified within the [[Cerithioidea]].<ref name="Strong 2011"/> From six to eight of these independent lineages occur in [[North America]].<ref name="Dillon R. T.">Dillon R. T. (2006). ''Chapter 21. Freshwater Gastropoda''. pages 251–259. In: Sturm C. F., Pearce T. A. & Valdés A. (eds.) (2006). ''The Mollusks: A Guide to Their Study, Collection, and Preservation''. American Malacological Society, 445 pp. {{ISBN|978-1-58112-930-4}}.</ref>
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