| Page last updatedWed 1 October 2025
 | The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win! 
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 Bivalvia | ... | Unionoidea | Unionidae | Unioninae | Anodontini | Alasmidontina | Pyganodon species Pyganodon grandis (Say, 1829): specimens44 available nominal species synonyms (72 total synonyms)
 Recent Taxonomic OpinionsPyganodon grandis — Graf & Cummings (2007), Cyr et al. (2007), Zanatta et al. (2007), Tiemann et al. (2007), Williams et al. (2008), ... Dai et al. (2025), Perkins et al. (2025), Chen et al. (2025), FMCS (2025), Cummings et al. (2025)Pyganodon simpsonaia [sic] — Cyr et al. (2007)
 Pyganodon grandis grandis — Watters et al. (2009)
 Anodonta grandis grandis — ITIS (2012)
 Anodonta grandis corpulenta — ITIS (2012)
 Anodonta grandis simpsoniana — ITIS (2012)
 Pyganodon simpsoniana — Doucet-Beaupré et al. (2012)
 P. grandis — Sheng et al. (2014), Marshall et al. (2018)
 Anodonta grandis — Kongim et al. (2015), Soliman et al. (2016)
 RangeWidespread in interior North America, from the Rio Grande to the Arctic. Invading east into the Atlantic Slope and west into the Pacific. Map of Georeferenced Specimens
 Canada
 MexicoUMMZ_104019.  
 unknown
 USA|  MCZ_161863
 [Shears Lake, Kent Co.], Michigan
 |  USNM_86664
 Bayou Teche, Louisiana
 |  USNM_86626
 Bear Grass Creek, near Louisville, Ky
 |  |  MCZ_161861
 Camp Lake, Michigan
 |  USNM_86633
 canal, near Cincinnati, Ohio
 |  UMMZ_104010
 Clear Lake, Ulvers Pt., Deuel Co., South Dakota
 |  |  USNM_86468
 Fort Winnebago
 |  USNM_86706
 Ft. Winnebago
 |  USNM_86657
 Harpeth R., Tenn
 |  |  USNM_86381
 Lake Champlain, Vermont
 |  USNM_86702
 Lake Concordia, Louisiana
 |  UAT_2225
 Lake Mary, 10 mi. SE Flagstaff, Coconino Co., Arizona
 |  |  USNM_86440
 Lake Pepin, Ohio
 |  USNM_86690
 Leon Co., Texas
 |  USNM_87806
 Leon, Texas
 |  |  USNM_86615
 Marietta, Ohio
 |  MCZ_150645
 Michigan
 |  USNM_86595
 Mohawk, N.Y.
 |  |  USNM_128835
 New Orleans
 |  SMF_4300
 Ohio, U.S.A.
 |  USNM_86540
 Poland, Ohio
 |  |  USNM_86659
 Port Gibson, Mississippi
 |  USNM_86666
 Red R., Alexandria, Louisiana
 |  MCZ_150644
 Sand Lake, Michigan
 |  |  MCZ_150633
 Shears Lake, Michigan
 |  MCZ_161867
 Slawsons Lake, Michigan
 |  USNM_86680
 Texas
 |  |  USNM_86426
 Topeka, Kas.
 |  USNM_86427
 Uphaupee Cr., ..., Ala.
 |  TMYERS_003
 Upper Lake Mary at “The Narrows”, Coconino Co., Arizona
 | 
 DMNH_149886. Lake Mary, 10 mi. SE Flagstaff, Coconino Co., Arizona DMNH_75128. Lake Mary, 10 mi. SE Flagstaff, Coconino Co., Arizona UMMZ_60218. Lake Mary, 9 mi. SE Flagstaff, Coconino Co., Arizona UF_517091. Lake McMillan Reservoir, N of Carlsbad, Eddy Co., New Mexico, USA Georeferenced Genbank Vouchers
 USAUMMZ_265697. (28S: AF305384, COI: AF156504, go to Genbank) Huron River, MI. |