Kingdom Animalia Linnaeus, 1758 - animals
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   Phylum Arthropoda Siebold, 1848 - arthropods
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     Subphylum Cheliceriformes
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       Class Chelicerata Heymons, 1901
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         Subclass Merostomata Dana, 1852 - horseshoe crabs see Class Xiphosura Latreille, 1802
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           Order Xiphosura Latreille, 1802 see Class Xiphosura Latreille, 1802
          Count: [*] 1f3g
             Family Limulidae Leach, 1819
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               Genus Carcinoscorpius Pocock, 1902
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               Genus Limulus Müller, 1785
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               Genus Tachypleus Leach, 1819
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