Classification of Hollingsworth 2006
Fm. †Holmiidae Hupé 1953
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G. †Esmeraldina Resser and Howel 1938
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†Esmeraldina elliptica Hollingsworth 2006
†Esmeraldina rowei Walcott 1910
G. †Grandinasus Hollingsworth 2006
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†Grandinasus argentus Walcott 1910
†Grandinasus auricampus Hollingsworth 2006
†Grandinasus patulus Hollingsworth 2006
G. †Holmiella Fritz 1972
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†Holmiella falx Hollingsworth 2006
†Holmiella millerensis Hollingsworth 2006
G. †Montezumaspis Hollingsworth 2006
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†Montezumaspis cometes Fritz 1995
†Montezumaspis parallela Fritz 1995
G. †Palmettaspis Fritz 1995
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†Palmettaspis consorta Fritz 1995
†Palmettaspis lidensis Fritz 1995