[organisms]
see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
[metazoans] Haeckel 1874 - multicellular animals
see Kingdom Animalia Linnaeus, 1758
Phylum Arthropoda Siebold, 1848 - arthropods
Class Malacostraca Latreille, 1802
Class Merostomata Dana, 1852 - horseshoe crabs
see Class Xiphosura Latreille, 1802
Class Ostracoda Latreille, 1802 - ostracods
Class †Trilobita Walch, 1771 - trilobites