Chelicerata Heymons 1901 
1.
Aglaspida Walcott 1911 
Aglaspis
2.
Euchelicerata nom. nov. 
(:185)
2.1. Xiphosurida Latreille 1802 
2.2. Metastomata nom. nov.
(:185)
2.2.1. Eurypterida Burmeister 1843 Eurypterus
2.2.2. Arachnida Lamarck 1801
Ctenophora Pocock 1873
= Cteidophora Borner 1902
= Pectinifera Lankester 1905 = Scorpiones Scorpio
Lipoctena
Pocock 1893 = Epectinata
Lankester 1805
Megoperculata
Börner 1902 =
Arachnomorpha Savory
1977 = Arachnidea v.d.Hammen
1977
Uropygi
Thorell 1882 =
Camarostomata Petrunkevitch 1949
Thelyphonida
Cambridge 1872 Thelyphonus =
Holopeltidia Börner 1904
Schizomida
Petrunkevitch 1949 
Schizomus=Hubbardia
= Schizopeltidia Börner 1904 =
Tartarides Cambridge 1872
Labellata
Petrunkevitch 1949
= Aranoides Savory 1977 Araneus
Amblypygi
Thorell 1883 =
Phrynichida Petrunkevitch 1945 Phrynichus
= Phrynus
Araneae
auct. Araneus
=
Araneida Clerck 1757 Araneus
=
Araneides Latreille 1801 Araneus
Apulmonata
Firstmann 1973
Palpigradi
Thorell 1888 =
Microthelyphonida Grassi 1885
Holotracheata
Börner 1902
Haplocnemata
Börner 1904 =
Apatellata v.d.Hammen 1977 =
Chelonethomorphae Savory 1977
Pseudoscorpiones
Pavesi 1880 = Chelonethi
Thorell 1885
Solifugae
Sundevall 1883 = Solpugida
Leach 1815 Solpuga
Cryptoperculata
Börner 1904 =
Opilionomophae Savory 1977
Opiliones
Sundevall 1833 = Phalangida
Petry 1833 Phalangium
Acaromorpha
Acarus
Ricinulei
Thorell 1897 = Meridiogastra
Karsch 1892
Acari
Sundevall 1833 Acarus
= Acarina Nitsch 1818 Acarus
= Acaromorpha Dubinin 1956 Acarus
...
Pantopoda Gerstaecker 1863
= Pycnogonida Latreille 1810 Pycnogonum