Class: SOLENOGASTRES Taxon Tree: SOLENOGASTRES [Subclass]-STERROFUSTIA [Order]
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Class: HELCIONELLOIDA Taxon Tree: ARCHAEOBRANCHIA [Subclass]-HELCIONELLIFORMES [Order]-HELCIONELLOIDEA [Superfamily]
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Class: HELCIONELLOIDA Taxon Tree: ARCHAEOBRANCHIA [Subclass]-HELCIONELLIFORMES [Order]-YOCHELCIONELLOIDEA [Superfamily]
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Class: HELCIONELLOIDA Taxon Tree: ARCHAEOBRANCHIA [Subclass]-HELCIONELLIFORMES [Order]
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Class: HELCIONELLOIDA Taxon Tree: ARCHAEOBRANCHIA [Subclass]-PELAGIELLIFORMES [Order]-PELAGIELLOIDEA [Superfamily]
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Class: HELCIONELLOIDA Taxon Tree: DIVASIBRANCHIA [Subclass]-KHAIRKHANIIFORMES [Order]
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Class: HYOLITHA Taxon Tree: CALYPTOPTOMATIDA [Order]
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Class: HYOLITHA Taxon Tree: CAMEROTHECIDA [Order]-CAMEROTHECINA [Suborder]
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Class: HYOLITHA Taxon Tree: CAMEROTHECIDA [Order]-DIPLOTHECINA [Suborder]
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Class: HYOLITHA Taxon Tree: CIRCOTHECIDA [Order]
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Class: HYOLITHA Taxon Tree: GLOBORILIDA [Order]
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Class: HYOLITHA Taxon Tree: HYOLITHIDA [Order]-HYOLITHINA [Suborder]
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