Classification of Walcott 1910

Or. †Opisthoparia Beecher
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Fm. †Mesonacidae Walcott 1891
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G. †Callavia Matthew 1897
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†Callavia bicensis Walcott 1910
†Callavia broggeri Walcott 1888
†Callavia burri Walcott 1910
†Callavia callavei Lapworth 1888
†Callavia cartlandi Raw 1909
†Callavia crosbyi Walcott 1910
†Callavia nevadensis Walcott 1910
G. †Elliptocephala Emmons 1844
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G. †Holmia Matthew 1890
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†Holmia kjerulfi Linnarsson 1871
†Holmia lundgreni Moberg 1892
†Holmia rowei Walcott 1910
G. †Mesonacis Walcott 1885
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†Mesonacis mickwitziae Schmidt 1888
†Mesonacis torelli Moberg 1892
†Mesonacis vermontana Hall 1859
Invalid names: Schmidtia Moberg 1899 [synonym], Schmidtiellus Moberg 1906 [synonym]
G. †Nevadia Walcott 1910
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†Nevadia weeksi Walcott 1908
G. †Olenelloides Peach 1894
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†Olenelloides armatus Peach 1894
G. †Olenellus Hall 1861
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†Olenellus argentus Walcott 1910
†Olenellus canadensis Walcott 1910
†Olenellus claytoni Walcott 1910
†Olenellus fremonti Walcott 1910
†Olenellus gigas Peach 1894
†Olenellus gilberti White 1874
†Olenellus lapworthi Peach and Horne 1892
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Invalid names: Olenellus intermedius Peach 1894 [synonym]
†Olenellus reticulatus Peach 1894
†Olenellus walcotti Shaler and Foerste 1888
G. †Paedeumias Walcott 1910
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†Paedeumias transitans Walcott 1910
G. †Peachella Walcott 1910
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†Peachella iddingsi Walcott 1884
G. †Wanneria Walcott 1910
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†Wanneria gracile Walcott 1910
†Wanneria walcottanus Wanner 1901
Invalid names: Olenellidae Walcott 1890 [synonym]