Classification of Zhan et al. 2010

Or. †Lingulida Waagen 1885
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Superfm. Linguloidea Menke 1828
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Fm. †Obolidae King 1846
Or. †Acrotretida Kuhn 1949
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Superfm. †Acrotretoidea Schuchert 1893
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Fm. †Acrotretidae Schuchert 1893
Or. †Orthida Schuchert and Cooper 1932
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Subor. †Orthidina Schuchert and Cooper 1932
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Superfm. †Plectorthoidea Schuchert and Le Vene 1929
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Fm. †Finkelnburgiidae Schuchert and Cooper 1931
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G. †Guoleella Zhan et al. 2010
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†Guoleella lata Zhan et al. 2010
Or. †Pentamerida Schuchert and Cooper 1931
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Subor. †Syntrophiidina Ulrich and Cooper 1936
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Superfm. †Porambonitoidea Davidson 1853
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Fm. †Tetralobulidae Ulrich and Cooper 1936
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G. †Palaeostrophia Ulridch and Cooper 1936
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†Palaeostrophia perilla Walcott 1924
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†Plectotrophia imparicostata Zhan et al. 2010
Or. †Billingsellida Schuchert 1893
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Subor. †Billingsellidina Schuchert 1893
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Superfm. †Billingselloidea Schuchert 1893
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Fm. †Billingsellidae Schuchert 1893
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G. †Billingsella Hall and Clarke 1892
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†Billingsella costata Zhan et al. 2010