superclassis Chelicerata
Heymons, 1901 
=
Euarachnida Lankester 1881
classis Merostomata
Woodward, 1886
= Delobranchia Lankester 1881 
= Palaeostraca Haeckel 1896
=
= Hydropneusta Pocock 1902 = Xiphosura Stormer 1944
= Merostomoidea
Beklemischev 1952
ordo Aglaspida Reach 1939 
Aglaspis
ordo Chasmataspida Caster et Brooks 1956 Chasmataspis
ordo Synziphosura R. et E. Richter 1929
ordo Limulida R. et E. Richter 1929 Limulus
= Xiphosura Stormer 1944
classis Scorpionomorpha
W. Dubinin, class. nov. Scorpio
subclassis Holactinochitinosi
A. Zachvatkin, 1952
ordo Eurypteroidea Burmeister 1843 Eurypterus
= Gigantostraca Haeckel 1896
ordo Scorpiones Hemprich and
Ehrenberg 1818 Scorpio = Pectinifera
Lankester 1881
subordo Apoxypodes
Thorell 1885
subordo Dionychopodes
Therell 1885
subclassis Pedipalpides
W. Dubinin, subclass. nov. 
ordo Uropygi Thorell, 1885
subordo Schizopeltidia
Borner 1904 = Tartarides
Cambridge 1918 = Schizomida
Petrunkevitch 1949 Schizomus
subordo Holopeltidia
Borner 1904 = Oxypoei
Thorell 1885 = Thelyphonida
Petrunkevitch 1949 Thelyphonus
ordo Amblypygi Thorell 1910
= Phrynida Pocock 1902 Phrynus
ordo Kustarachnida Scudder 1890 Kustarachne
ordo Palpigradi Thorell 1900
= Microthelyphonida Grassi et Calandrccio 1885
= Latisterna Petrunkevitch 1949
ordo Pseudoscorpionoidea Beier 1932
= Cheliferes
Gervais 1844 Chelifer = Chernetidae
Menge 1855 
= Chelonethi
Thorell 1882
ordo Ricinulei Thorell 1892
= Podogonata Cook [1800]
= Podogonida Martinov 1934
= Cucullifera Petrunkevich 1949
classis Arachnida (Cuvier
1812) W. Dubinin, emend.
subclassis Opiliomorphae
W. Dubinin, subclass. nov. Opilio
= Phalangium
ordo Haptopoda Pocock 1911
ordo Phalangiotarbi Haase 1890 Phalangiotarbus
= Architarbi Petrunkevitch 1949 Architarbus
ordo Opiliones Sundevall 1833
= Phalangides auct. Phalangium
= Phalangida Koch & Berendt 1854 Phalangium
subordo Cyphophthalmi
Simon 1879 Cyphophthalmus
= Siro
subordo Laniatores
Thorell 1876
subordo Palpatores
Thorell 1876
subclassis Soluta
Petrunkevitch 1949
ordo Trigonotarbi Petrunkevitch
1949 Trigonotarbus
ordo Anthracomarti Karsch 1882 Anthracomartus
= Meridogastra Thorell 1900
subclassis Araneae
Clerk 1757 = Aranei
auct. Araneus = Araneina
auct. Araneus
= Aranina
Koch & Berendt 1854 Araneus
ordo Liphistiomorphae Pocock 1892 Liphistius
= Mesothelae auct.
ordo Arachnomorphae (Petrunkevitch
1933) W. Dubinin, emend.
ordo Mygalomorphae Pocock 1892 Mygale=Atypus
= Tetrapneumones auct.
= Orthognatha Berland 1932
subordo Nelipoda
Gerhardt und Kastner 1938
subordo Hypodemata
Gerhardt und Kastner 1938
subordo Pycnotheloidea Gerhardt
und Kastner 1938
ordo Araneomorphae Millot 1933 Araneus
= Dipneumones auct. = Dipneumomorphae Petrunkevitch 1946 = Labidognatha
auct.
subordo Ecribellatae
Gerhard und Kastner 1938
subordo Cribellatae
Gerhard und Kastner 1938
classis Solifugomorpha W.
Dubinin, class. nov.
(:51)
ordo Solifugae Sundevall 1833
classis Acaromorpha W.
Dubinin, class. nov. Acarus
= Acari auct. Acarus
=
Acarina auct. Acarus
=
Rhynchostomi Lankester 1881
ordo Acariformes A. Zachvatkin 1952 Acarus
= Actinochitinosi Grandjean 1935
subordo Palaeacariformes Tragardh
1932 = Palaeacaroidea Ewing 1934 = Astegasima
Grandjean 1932
subordo Oribatei Duges 1833
=
Cryptostigmata Berlese 1896 = Stegasima Grandjean 1932
subordo Sarcoptiformes Reuter
1909 Sarcoptes
= Acaridiae Latreille 1806 Acarus
= Astigmata Canestrini
1891
subordo Trombidiformes Reuter 1909 Trombidium
subordo Tetrapodili Bremi 1872 = Eriophyiformes
Reuter 1909
ordo Parasitiformes (Reuter 1909) A. Zachvatkin
1952, emend. Parasitus=Ixodes = Anactinochitinosi Grandjean 1946
subordo Holothyroidea Reuter 1909 Holothyrus
subordo Mesostigmata Canestrini
1819
subordo Ixodides Leach 1815 Ixodes
ordo Opilioacarina With 1902 Opilioacarus
= Notostigmata
With 1903