Taxonomy clear
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Percivalia nebulosaEarly Valanginian - Middle Berriasian
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Percivalia hauxtonensisLate Cenomanian - Early Albian
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Percivalia fenestrataEarly Turonian - Early Berriasian
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Percivalia arataEarly Berriasian - Early Tithonian
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Salomonia tuzuniorumEarly Campanian
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Salomonia elkefensisLate Maastrichtian - Early Maastrichtian
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Salomonia biperforatusEarly Campanian - Early Coniacian
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Hattneria scutulaEarly Campanian - Late Valanginian
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Hattneria levisEarly Maastrichtian - Late Campanian
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Hattneria glabraLate Campanian - Early Campanian
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Hattneria elegansLate Campanian - Early Turonian
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Hattneria cryptochondrusLate Campanian - Early Turonian
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Amphizygus minimusEarly Maastrichtian - Middle Santonian
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Amphizygus nanusLate Campanian - Early Coniacian
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Amphizygus brooksiiEarly Maastrichtian - Early Coniacian
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Amphizygus megalopsSantonian - Albian
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Lapideacassis tricornusEarly Maastrichtian - Middle Albian
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Lapideacassis variusPriabonian - Aptian
