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[Merostomata] (Class) - horseshoe crabs ..[†Aglaspida] (Order) ..[†Chasmataspida] (Order) ..†Eolimulus (Genus) ..[†Eurypterida] (Subclass) ..†Gdowia (Genus) ..[†Gigantostraca] (Order) ..[†Sanctacarus] (Genus) ..[Xiphosura] (Order) ..[Xiphosura] (Subclass)

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Last updated: 21 Sep 2025