Pyganodon grandis

Pyganodon grandis
Conservation status
Least Concern  (IUCN 3.1) [1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Unionida
Family:	Unionidae
Genus:	Pyganodon
Species:	P. grandis
Binomial name
Pyganodon grandis (Say, 1829)
Synonyms [2]
List Anodonta grandisSay, 1829 Anodonta grandis subsp. grandisSay, 1829 Anodonta grandis subsp. simpsonianaLea, 1861 Anodonta grandis subsp. corpulentaCooper, 1834 Anodonta lugubrisSay, 1829 Anodonta inflataRafinesque, 1831 Anodonta stewartianaLea, 1834 Symphynota benedictensisLea, 1834 Anodonta corpulentaCooper, 1834 Anodonta planaLea, 1834 Anodonta declivisConrad, 1834 Anodonta giganteaLea, 1838 Anodonta ovataLea, 1838 Anodonta salmoniaLea, 1838 Anodonta decoraLea, 1838 Anodonta pepinianusLea, 1838 Anodonta harpethensisLea, 1840 Anodonta footianaLea, 1840 Anodonta maryattanaLea, 1840 Anodonta globosaLea, 1841 Anodonta virensLea, 1852 Anodonta linnaeanaLea, 1852 Anodonta opacaLea, 1852 Anodonta lewisiiLea, 1857 Anodonta danielsiiLea, 1858 Anodonta gesneriiLea, 1858 Anodonta texasensisLea, 1859 Anodonta kennicottiiLea, 1861 Anodonta simpsonianaLea, 1861 Anodonta leonensisLea, 1862 Anodonta dallasianaLea, 1863 Anodonta bealeiLea, 1863 Anodon subangulataJ.G. Anthony, 1865 Anodon subinflataJ.G. Anthony, 1865 Anodon imbricataJ.G. Anthony, 1865 Anodon micansJ.G. Anthony, 1865 Anodon opalinaJ.G. Anthony, 1865 Anodon mcnieliiJ.G. Anthony, 1866 Anodon subgibbosaJ.G. Anthony, 1866 Anodon inornataJ.G. Anthony, 1866 Anodon nopalatensisSowerby, 1867 Margaron benedictiiLea, 1870 Anodonta sulcataKüster, 1873 Anodonta somersiiCall, 1880 Anodonta houghtonensisCurrier in DeCamp, 1881 Anodonta grijalvaeMorelet, 1884 Anodonta tabascensisMorelet, 1884 Anodonta dakotaFrierson, 1910 Anodonta dakotanaUtterback, 1915 Anodonta inflata subsp. viridisRafinesque, 1831 Anodonta inflata subsp. fuscataRafinesque, 1831 Anodonta inflata subsp. zonalisRafinesque, 1831

Pyganodon grandis, or the giant floater, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This species is fast-growing, large, and has a short lifespan. It is variable and widespread ^[3] across the United States and southeastern Canada.

Original description (Say 1829): "Shell very large, subovate; disk unequally wrinkled and undulated transversely, dark yellowish brown; umbo elevated; beak slightly elevated, with generally, two or three small sinuous, acute undulations; hinge margin slightly arquated, sometimes nearly rectilinear, somewhat angulated at its anterior termination, thence the edge descends by a nearly rectilinear, or slightly concave line to the anterior margin, which is considerably narrowed; sinus of the hinge margin concave; posterior margin widely rounded; within white margined, particularly before, with dusky."

References

1. Cummings, K.; Cordeiro, J. (2012). "Pyganodon grandis". IUCN Red List of Threatened Species . 2012: e.T189102A1919024. doi: 10.2305/IUCN.UK.2012-1.RLTS.T189102A1919024.en . Retrieved 8 June 2023.
2. "Pyganodon grandis (Say, 1829)". Integrated Taxonomic Information System . Retrieved 8 June 2023.
3. "MUSSELp | Mussel of the Month". mussel-project.uwsp.edu. Retrieved 2023-08-03.

• Binney, W.G. 1858. The complete writings of Thomas Say on the conchology of the United States. Bailliere Publ. NY
• Haag, W. R. (2012). North American Freshwater Mussels: Natural History, Ecology, and Conservation. Cambridge University Press. ISBN   978-0521199384
• Say, T. 1829. Descriptions of some new terrestrial and fluviatile shells of North America. New Harmony Disseminator of Useful Knowledge, New Harmony, Indiana. (see the description also in Binney's summary of Say's writing, 1858). This article incorporates text from this source, which is in the public domain .