Sphaerium rhomboideum - (Say, 1822)
Rhomboid Fingernailclam
Taxonomic Status: Accepted
Related ITIS Name(s): Sphaerium rhomboideum (Say, 1822) (TSN 81396)
Unique Identifier: ELEMENT_GLOBAL.2.110353
Element Code: IMBIV52060
Informal Taxonomy: Animals, Invertebrates - Mollusks - Other Mollusks
 
Kingdom Phylum Class Order Family Genus
Animalia Mollusca Bivalvia Veneroida Sphaeriidae Sphaerium
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Concept Reference
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Concept Reference: Turgeon, D.D., J.F. Quinn, Jr., A.E. Bogan, E.V. Coan, F.G. Hochberg, W.G. Lyons, P.M. Mikkelsen, R.J. Neves, C.F.E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F.G. Thompson, M. Vecchione, and J.D. Williams. 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.
Concept Reference Code: B98TUR01EHUS
Name Used in Concept Reference: Sphaerium rhomboideum
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 09Jan2015
Global Status Last Changed: 07Jun2004
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G5 - Secure
Reasons: This is a widespread species, with many occurrences and no significant threats at a global level.
Nation: United States
National Status: N5 (07Jun2004)
Nation: Canada
National Status: N5 (01Aug2017)

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Idaho (S4), Kentucky (SU), Massachusetts (SNR), Michigan (SNR), Montana (SNR), Wisconsin (SNR)
Canada British Columbia (S4S5), Manitoba (S3), New Brunswick (SU), Newfoundland Island (S1), Nova Scotia (SU), Ontario (S4), Quebec (SNR), Saskatchewan (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent: 200,000 to >2,500,000 square km (about 80,000 to >1,000,000 square miles)
Range Extent Comments: Range encompasses a band between 41 and 58 degrees latitude from the Pacific coastal zone to the Atlantic coastal zone. In Canada, it ranges from Prince Edward Island and New Brunswick west to southern British Columbia. In the United States, it ranges from Maine to Pennsylvania in the east to Montana and Idaho in the west (Herrington 1962, Mackie 2007). Although documented from Alaska (see Baxter 1987), Herrington (1962) and Mackie (2007) suggest the record is a misidentification of Sphaerium nitidum.

Number of Occurrences: > 300
Number of Occurrences Comments: This species is widely distributed in Canada and United States and represented by a large number of occurrences (subpopulations) probably >300.

Population Size Comments: Total population size is unknown.

Overall Threat Impact: Low
Overall Threat Impact Comments: No major threats exist at the present time or for the foreseeable future. Pollution, changes in land use, and habitat modification, such as drainage, are likely not of sufficient scope and severity to cause immediate problems.

Short-term Trend Comments: Trend over the past 10 years is unknown but probably relatively stable.

Long-term Trend: Relatively Stable (<=10% change)
Long-term Trend Comments: Probably relatively stable because of a large number of occurrences, a variety of dispersal mechanisms, rescue from neighboring subpopulations, and reproductive strategies that accommodates periods of stress (Mackie and Flippance 1983a,b).

Other NatureServe Conservation Status Information

Distribution
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Global Range: (200,000 to >2,500,000 square km (about 80,000 to >1,000,000 square miles)) Range encompasses a band between 41 and 58 degrees latitude from the Pacific coastal zone to the Atlantic coastal zone. In Canada, it ranges from Prince Edward Island and New Brunswick west to southern British Columbia. In the United States, it ranges from Maine to Pennsylvania in the east to Montana and Idaho in the west (Herrington 1962, Mackie 2007). Although documented from Alaska (see Baxter 1987), Herrington (1962) and Mackie (2007) suggest the record is a misidentification of Sphaerium nitidum.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.

Map unavailable!:
Distribution data for U.S. states and Canadian provinces is known to be incomplete or has not been reviewed for this taxon.
Endemism: occurs (regularly, as a native taxon) in multiple nations

U.S. & Canada State/Province Distribution
United States ID, KY, MA, MI, MT, WI
Canada BC, MB, NB, NF, NS, ON, QC, SK

Range Map
No map available.

Ecology & Life History
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Diagnostic Characteristics: This is the first recorded diploid chromosome number (2n = 44) found in any of the Sphaeriidae (Petkeviciute et al., 2007).
Habitat Type: Freshwater
Non-Migrant: N
Locally Migrant: N
Long Distance Migrant: N
Riverine Habitat(s): Low gradient, MEDIUM RIVER
Lacustrine Habitat(s): Shallow water
Habitat Comments: Habitat includes small lakes and ponds with muddy bottoms and large mats of algae and macrophytic plants in water from 30-45 cm deep (Mackie 2007, Herrington 1962). It is also found in eddies in creeks and rivers (Herrington 1962). In Wisconsin the species is common in gravel and coarse sand substrates in rivers (Baker 1928 in Mackie 2007).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 09Jan2015
NatureServe Conservation Status Factors Author: Mackie, G.L.

Zoological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).

References
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  • Baker, F.C. 1928b. The freshwater Mollusca of Wisconsin: Part II. Pelecypoda. Bulletin of the Wisconsin Geological and Natural History Survey, University of Wisconsin, 70(2): 1-495.

  • Baxter, R. 1987. Mollusks of Alaska: a listing of all mollusks, freshwater, terrestrial, and marine reported from the State of Alaska, with locations of the species types, maximum sizes and marine depths inhabited. Shells and Sea Life, Bayside, California. 163 pp.

  • Bogan, A. 2013. World checklist of freshwater Bivalvia species. World Wide Web electronic publication. Version 2013 January 24.  Available online at http://fada.biodiversity.be/group/show/14. Accessed 11 July 2014.

  • Burch, J. B. 1972. Freshwater Sphaeriacean clams (Mollusca:Pelecypoda) of North America. EPA Biota of Freshwater Ecosystems Identification Manual No. 3. 31 pp.

  • General Status 2015, Environment Canada. 2015. Manitoba Mollusk species list and subnational ranks proposed by an expert.

  • Graf, D.L. and K.S. Cummings. 2014. MUSSELp: the freshwater mussels (Unionoida) of the world (and other less consequential bivalves), updated 14 January 2014. MUSSEL Project Web Site, http://www.mussel-project.net/.

  • Herrington, H.B. 1962. A revision of the Sphaeriidae of North America (Mollusca: Pelecypoda). Miscellaneous Publications, Museum of Zoology, University of Michigan, No. 118. 74 pp.

  • La Rocque, A. 1967. Pleistocene Mollusca of Ohio. Department of Natural Resources, Division of Geological Survey Bulletin 62, Part 2. 113-365 + 8 plates.

  • Lee, J.S. 2000. Freshwater molluscs of British Columbia: assessments for all known or potential taxa. Unpubl. rep. submitted to the BC Conservation Data Centre, Minist. Envrion., Lands and Parks, Victoria, BC. 107pp.

  • Lee, J.S. 2000c. The distribution and ecology of the freshwater molluscs of northern British Columbia. M.Sc Thesis. University of Northern British Columbia, Prince George. 38 pp.

  • Mackie, G. 2014. General Status rank assessment of freshwater molluscs of British Columbia. Prepared for Canadian Wildlife Service, Environment Canada. Gatineau, PQ.

  • Mackie, G.L. 2007. Biology of Freshwater Corbiculid and Sphaeriid Clams of North America. Ohio Biological Survey Bulletin New Series, 15(3):ix-436.

  • Mackie, G.L. and L.A. Flippance. 1983a. Growth dynamics in Sphaerium rhomboideum (Bivalvia: Pisidiidae). Canadian Journal of Zoology 61(4):868-873.

  • Mackie, G.L. and L.A. Flippance. 1983b. Life history variations in two populations of Sphaerium rhomboideum (Bivalvia: Pisidiidae). Canadian Journal of Zoology 61(4):860-867.

  • Petkeviciute, R., G. Staneviciute, V. Stunzenasa, T. Lee, and D. O. Foighil. 2007. Pronounced karyological divergence of the North American congeners Sphaerium rhomboideum and S. occidentale (Bivalvia: Veneroida: Sphaeriidae). Journal of Molluscan Studies, 73: 315-321.

  • Turgeon, D.D., J.F. Quinn, Jr., A.E. Bogan, E.V. Coan, F.G. Hochberg, W.G. Lyons, P.M. Mikkelsen, R.J. Neves, C.F.E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F.G. Thompson, M. Vecchione, and J.D. Williams. 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.

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