Anodonta dejecta Lewis, 1875

Woebegone floater

Taxonomy & Nomenclature

Synonym/s: Anodonta (Arnoldina) dejecta (J. Lewis, 1875)

See Graf & Cummings (2025) for a more complete taxonomic history. The Arizona population of A. dejecta was synonymized with A. californiensis by (Bequaert and Miller, 1973). The whole species was synonymized with A. californiensis by (Williams et al., 2017).

Conservation Status

Invalid (synonym of A. californiensis) (Williams et al., 2017)

Last record: late 1800's (confirmed) (Dettman et al., 2004); 1922 (uncertain) (NatureServe, 2014)

Distribution & Habitat

California, USA

Biology & Ecology

Hypodigm

Media

References

Original scientific description:

Lewis, J. (1875). Description of a new species of Anodonta. Field and Forest 1: 26-27.

Other references:

Bequaert, J. C. and Miller, W. B. (1973). The mollusks of the arid Southwest with an Arizona check list. Tuscon, Arizona: University of Arizona Press.

Bowersox, J. Richard. (2003). Salinity tolerance of the freshwater mussel Anodonta dejecta Lewis in Holocene Lake Cahuilla, southeastern California: a caution in the use of fossil freshwater mussels as a freshwater indicator in stable isotope studies. Seattle Annual Meeting (November 2-5, 2003).

Burch, J. B. (1975). Freshwater Unionacean Clams (Mollusca: Pelecypoda) of North America. 204 pp.

Chong, J. P., Brim-Box, J. C., Howard, J. K., Wolf, D., Myers, T. L. and Mock, K. E. (2008). Three deeply divided lineages of the freshwater mussel genus Anodonta in western North America. Conservation Genetics 9: 1303-1309. https://doi.org/10.1007/s10592-007-9485-x

Contreras-Arquieta, A. (2000). Bibliografía y lista taxonómica de las especies de moluscos dulceacuícolas en México. Mexicoa 2(1): 40-53.

Cummings, Kevin S. and Graf, D. L. (2010). Mollusca: Bivalvia, pp. 309-384. In: Thorp, J. H. and Covich, A. P. (eds.). Ecology and Classification of North American Freshwater Invertebrates. 3rd ed. Amsterdam, The Netherlands: Elsevier.

Dettman, D. L., Flessa, K. W., Roopnarine, P. D., Schone, B. R. and Goodwin, D. H. (2004). The use of oxygen isotope variation in shells of estuarine mollusks as a quantitative record of seasonal and annual Colorado River discharge. Geochimica et Cosmochimica Acta 68(6):1253-1263.

Frierson, L. S. (1927). A Classified and Annotated Check List of the North American Naiades. Waco, Texas: Baylor University Press. 111 pp.

Graf, Daniel L. and Cummings, Kevin S. (2007). Review of the systematics and global diversity of freshwater mussel species (Bivalvia: Unionoida). Journal of Molluscan Studies 73(4): 291-314. https://doi.org/10.1093/mollus/eym029

Graf, Daniel L. and Cummings, Kevin S. (2021). A ‘big data’ approach to global freshwater mussel diversity (Bivalvia: Unionoida), with an updated checklist of genera and species. Journal of Molluscan Studies 87(1): eyaa034.

Graf, Daniel L. and Cummings, Kevin S. (2025). The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves). MUSSEL Project Web Site, https://www.mussel-project.net/. Accessed 26 June 2025.

Haas, F. (1969a). Superfamilia Unionacea. Das Tierreich 88: x, 1-663. Walter de Gruyter & Co., Berlin.

Haas, F. (1969b). Superfamily Unionacea. Treatise on Invert. Paleo: N411-N470.

Hannibal, H. (1912). A synopsis of the Recent and Tertiary freshwater Mollusca of the Californian Province, based upon an ontogenetic classification. Proceedings of the Malacological Society of London 10(2): 112-166.

Henderson, J. (1935). Fossil non-marine Mollusca of North America. Geological Society of America, Special Paper 3: 1-313. https://doi.org/10.1130/SPE3-p1

Johnson, R. I. (1980). Zoogeography of North American Unionacea (Mollusca: Bivalvia) north of the maximum Pleistocene glaciation. Bulletin of the Museum of Comparative Zoology 149(2): 77-189.

Mock, K. E., Brim Box, J. C., Chong, J. P., Furnish, J. and Howard, J. K. (2013). Comparison of population genetic patterns in two widespread freshwater mussels with contrasting life histories in western North America. Molecular Ecology 22(24): 6060-6073. https://doi.org/10.1111/mec.12557

MolluscaBase eds. (2025). MolluscaBase. Anodonta dejecta J. Lewis, 1875. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=857226 on 2025-06-27

NatureServe. (2014). NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Availableat: http://explorer.natureserve.org. (Accessed: January 29, 2015).

NatureServe. (2025). Anodonta californiensis: California Floater. NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer [web application]. NatureServe, Arlington, Virginia. Available at: https://explorer.natureserve.org/ [Accessed 28 June 2025]

Pilsbry, H. A. and Ferriss, J. H. (1919). Mollusca of the southwestern states IX: The Santa Catalina, Rincon, Tortillita and Galiuro Mountains. X. The Mountains of the Gila Headwaters. Proceedings of the Academy of Natural Sciences of Philadelphia, 70(1918): 282-333.

Simpson, Charles Torrey. (1894). Types of Anodonta dejecta rediscovered. Nautilus 8(5): 52-53.

Simpson, Charles Torrey. (1900). Synopsis of the naiades, or pearly fresh-water mussels. Proceedings of the United States National Museum 22(1205): 501-1044, pl. 18.

Simpson, Charles Torrey. (1914). A descriptive catalogue of the naiades, or pearly fresh-water mussels. Part I Unionidae Truncilla–Margaritana. Detroit, Michigan: Bryant Walker. xi + 524 pp.

Thiele, J. (1934). Handbuch der systematischen Weichtierkunde 3: 779-1022.

Turgeon, D. D., Quinn, J. F., Jr., Bogan, A. E., Coan, E. V., Hochberg, F. G., Lyons, W. G., Mikkelsen, P. M., Neves, R. J., Roper, C. F. E., Rosenberg, G., Roth, B., Scheltema, A., Thompson, F. G., Vecchione, M. and Williams, J. D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks. 2nd Edition. American Fisheries Society Special Publication 26, Bethesda, Maryland: 526 pp.

Williams, James D., Bogan, Arthur E., Butler, Robert S., Cummings, Kevin S., Garner, Jeffrey T., Harris, John L., Johnson, Nathan A. and Watters, G. Thomas. (2017). A revised list of the freshwater mussels (Mollusca: Bivalvia: Unionida) of the United States and Canada. Freshwater Mollusk Biology and Conservation 20: 33-58.

Wright, Berlin Hart. (1888). Check List of North American Unionidae and Other Fresh Water Bivalves. Portland, Oregon: Dore & Cook, Printers. 8 pp. (un paginated).

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