# Pyganodon lacustris

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Species of bivalve

Pyganodon lacustris Conservation status Least Concern (IUCN 3.1)[1] Apparently Secure (NatureServe)[2] Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Unionida Family: Unionidae Genus: Pyganodon Species: P. lacustris Binomial name Pyganodon lacustris (Lea, 1857)

***Pyganodon lacustris*** is a [species](/source/Species) of [freshwater mussel](/source/Freshwater_mussel), an [aquatic](/source/Aquatic_animal) [bivalve](/source/Bivalve) [mollusk](/source/Mollusk) in the family [Unionidae](/source/Unionidae), the river mussels. It is [endemic](/source/Endemism) to the [United States](/source/United_States), where it is known to occur in [Illinois](/source/Illinois), [Ohio](/source/Ohio), [Michigan](/source/Michigan), [New York](/source/New_York_(state)), [Indiana](/source/Indiana) and [Wisconsin](/source/Wisconsin). It may also occur in the [Great Lakes](/source/Great_Lakes) and into [Canada](/source/Canada), however its full range has not been fully assessed.[1] It is commonly called the **lake floater**.[3]

## Description

*Pyganodon lacustris* varies in size with the largest found to be around 20 centimeters (8 inches)[4] with an average of around 10 centimeters (4 inches). They have an elliptical shape and is generally long and thin. The ventral is straight to slightly curved and color ranges from yellow-green in adolescence to dark brown or black in adulthood.[5]

## References

1. ^ [***a***](#cite_ref-IUCN_1-0) [***b***](#cite_ref-IUCN_1-1) Bogan, A.E.; Cordeiro, J. (2011). ["*Pyganodon lacustris*"](https://www.iucnredlist.org/species/189753/8766462). *[IUCN Red List of Threatened Species](/source/IUCN_Red_List)*. **2011** e.T189753A8766462. [doi](/source/Doi_(identifier)):[10.2305/IUCN.UK.2011-2.RLTS.T189753A8766462.en](https://doi.org/10.2305%2FIUCN.UK.2011-2.RLTS.T189753A8766462.en). Retrieved 30 December 2025.

1. **[^](#cite_ref-NS_2-0)** [NatureServe](/source/NatureServe). ["*Pyganodon lacustris*"](https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.113595/). *NatureServe Explorer*. Arlington, Virginia. Retrieved 30 December 2025.

1. **[^](#cite_ref-3)** ["Lake Floater (Pyganodon lacustris)"](http://dnr.wi.gov/topic/EndangeredResources/Animals.asp?mode=detail&SpecCode=IMBIV54040). *dnr.wi.gov*. Retrieved 2017-09-22.

1. **[^](#cite_ref-4)** ["Pyganodon lacustris"](http://animaldiversity.org/accounts/Pyganodon_lacustris/). *Animal Diversity Web*. Retrieved 2017-09-22.

1. **[^](#cite_ref-5)** ["Pyganodon lacustris (Lake floater) - MNFI Rare Species Explorer"](https://mnfi.anr.msu.edu/explorer/species.cfm?id=19860). *mnfi.anr.msu.edu*. Retrieved 2017-09-22.

Taxon identifiers Pyganodon lacustris Wikidata: Q3805091 BOLD: 667260 CoL: 4QNGH EoL: 590692 GBIF: 2287957 iNaturalist: 151718 IRMNG: 11058279 ITIS: 568180 IUCN: 189753 NatureServe: 2.113595 NCBI: 1009863 Open Tree of Life: 929384 WoRMS: 857390 Anodonta lacustris Wikidata: Q106029643 CoL: 6766H GBIF: 8030308 ITIS: 906950 WoRMS: 861324

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Adapted from the Wikipedia article [Pyganodon lacustris](https://en.wikipedia.org/wiki/Pyganodon_lacustris) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Pyganodon_lacustris?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.