 Natura - nature | | Mundus Plinius - physical world | | Naturalia - natural bodies | | Biota | | Domain Eukaryota Chatton, 1925 - eukaryotes | | Unikonta | | Opisthokonta Cavalier-Smith, 1987 | | Holozoa | | Kingdom Animalia C. Linnaeus, 1758 - animals | | Epitheliozoa Ax, 1996 | | Eumetazoa Bütschli, 1910 - eumetazoans | | Bilateria Hatschek, 1888 - bilaterians | | Eubilateria Ax, 1987 | | Protostomia Grobben, 1908 | | Ecdysozoa A.M.A. Aguinaldo et al., 1997 - ecdysozoans | | Superphylum Panarthropoda | | Phylum Arthropoda Latreille, 1829 - arthropods | | Euarthropoda | | Subphylum Arachnomorpha Heider, 1913 | | Infraphylum Cheliceriformes | | Superclass Chelicerata |  Epiclass Euchelicerata Weygoldt & Paulus, 1979 |  Class Xiphosura Latreille, 1802 - horseshoe crabs |  Order †Chasmataspidida Caster & Brooks, 1956 | | Class †Eurypterida Burmeister, 1843 - sea scorpions | | Class Arachnida Cuvier, 1812 |
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