Onychophora

Myriapoda

Hexapoda

Crustacea

Xiphosura

Pycnogonida

Palpigradi

Acari

Ricinulei

Amblypygi

Araneae

Schizomida

Thelyphonida

Opiliones

Scorpiones

Solifugae

Pseudoscorpiones