phylum Appendiculata
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subphylum
Rotifera
subphylum Chaetopoda =
Annelida
subphylum Arthropoda
Siebold et Stannius 1845
= Condylopoda = Gnathopoda
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grada Hyparthropoda
(hypotetical forms)
grada Protarthropoda
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classis Onychophora 
grada Euarthropoda
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1.classis Diplopoda
Juliformia
Symphyla
Pauropoda
2.classis Arachnida 
grada Anomomeristica
(gen. Phacops)
grada Nomomeristica 
Pantopoda
(gen. Pycnogonum)
Euarachnida
(gen. Limulus, Scorpio,
Mygale, Acarus)
3.classis Crustacea 
grada Entomostraca 
grada Malacostraca 
4.classis Chilopoda 
5.classis Hexapoda
grada x Agnatha Aprostomera
= Chaetopoda
grada 1 Monognatha
Monoprostomera = Onychopora
grada 2 Dignatha
Monoprostomera = Diplopoda
grada 3 Pantognatha
Diprostomera = Arachnida
grada 4 Pantognatha
Triprostomera
Crustacea
Chilopoda
Hexapoda
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Aprostomera |
Monoprostomera  |
Diprostomera  |
Triprostomera  |
Agnatha |
Chaetopoda |
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Monognatha  |
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Peripatus, etc. |
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Dignatha  |
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Diplopoda |
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Pantognatha  |
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Arachnida |
Crustacea
Chilopoda
Hexapoda |
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