Photo Gallery

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC

© The Field Museum - CC BY-NC
Taxonomy
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- Species: Orbiculoidea batesvillensis S. Weller, 1897
- Species: Orbiculoidea convexa (Shumard, 1858)
- Species: Orbiculoidea hardinensis Moore, 1928
- Species: Orbiculoidea jervensis (Barrett, 1878)
- Species: Orbiculoidea keokuk (Gurley, 1884)
- Species: Orbiculoidea minuta Mather, 1915
- Species: Orbiculoidea missouriensis (Shumard, 1858)
- Species: Orbiculoidea nitida (Phillips, 1836)
- Species: Orbiculoidea sampsoni (S. A. Miller, 1891)
- Species: Orbiculoidea tenuistriata (Ulrich, 1878)
- Species: Orbiculoidea herzeri Hall & Clarke, 1892
- Species: Orbiculoidea numulus
- Species: Orbiculoidea concentrica Wahlenberg, 1821
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- Genus: Platymena Cooper, 1956
- Genus: Strophomena
- Genus: Strophomena (strophodonta)
- Genus: Pentlandina
- Genus: Holtedahlina
- Species: Holtedahlina sulcata (Hall & Clarke, 1892)
- Genus: Oepikina
- Species: Strophomena abscissa
- Species: Strophomena analoga
- Species: Strophomena concordensis
- Species: Strophomena fluctuosa
- Species: Strophomena halli
- Species: Strophomena alternata
- Genus: Opikina
- Genus: Titanomena Bergström, 1968
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- Species: Atrypa nodostriata Hall, 1857
- Species: Atrypa clarkei Warren
- Species: Atrypa congesta Conrad, 1842
- Species: Atrypa devoniana Webster, 1921
- Species: Atrypa hystrix
- Species: Atrypa independencis (sic) Webster, 1921
- Species: Atrypa independensis Webster, 1921
- Species: Atrypa infrequens S. Weller, 1914
- Species: Atrypa lineata Webster, 1921
- Species: Atrypa marginalis (Dalman, 1828)
- Species: Atrypa reticularis C. L. Fenton, 1918
- Species: Atrypa spinosa
- Species: Atrypa subhannibalensis
- Species: Atrypa sulcata Vanuxem, 1842
- Species: Atrypa trowbridgei Fenton & Fenton, 1930
- Species: Atrypa varicostata
- Species: Atrypa waterlooensis
- Species: Atrypa waterlooensis (form b) Webster, 1921
- Species: Atrypa newsomesis
- Species: Atrypa rugosa
- Species: Atrypa praemarginalis (Savage, 1913)
- Species: Atrypa putilla (Hall & Clarke, 1893)
- Species: Atrypa neglecta (Hall, 1852)
- Species: Atrypa lamellata (Hall, 1852)
- Species: Atrypa camura (Hall, 1852)
- Species: Atrypa rotunda Stambrook
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- Species: Whitfieldella intermedia
- Species: Whitfieldella hyale (Billings, 1862)
- Species: Whitfieldella billingsana (Meek & Worthen, 1868)
- Species: Whitfieldella accuminata Savage, 1913
- Species: Whitfieldella ovoides Savage, 1913
- Species: Whitfieldella nitida (Hall, 1843)
- Species: Whitfieldella nucleolata (Hall, 1852)
- Species: Whitfieldella oblata (Hall, 1852)
- Species: Whitfieldella cylindrica (Hall, 1852)
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- Species: Platystrophia regularis Shaler, 1865
- Species: Platystrophia ponderosa Foerste
- Species: Platystrophia lynx
- Species: Platystrophia acuminata (James, 1878)
- Species: Platystrophia annieana Foerste, 1910
- Species: Platystrophia biforata (Schlotheim, 1820)
- Species: Platystrophia profundosulcata (Meek, 1873)
- Species: Platystrophia daytonensis (Foerste, 1885)
- Species: Platystrophia trentonensis McEwan, 1919
- Species: Platystrophia crassa
- Species: Platystrophia laticosta (Meek, 1873)
- Species: Platystrophia biforata laticosta Hall & Clarke, 1892