Eukaryota; Opisthokonta; Metazoa; Eumetazoa; Deuterostomia

 Eukaryota; Opisthokonta; Metazoa; Eumetazoa; Protostomia

   Arthropoda (Arthropods)

     Insecta (Insects)

     Collembola (Springtails)

     Branchiopoda (Branchiopods)

     Copepoda (Copepods)

     Malacostraca (Arachnids)

     Thecostraca

     Arachnida

       Ixodida (Ticks)

         Ixodidae (Hard ticks)

         Argasidae (Soft ticks)

       Mesostigmata

       Trombidiformes

       Sarcoptiformes

       Scorpiones (Scorpions)

       Araneae (Spiders)

     Merostomata (Horseshoe crabs)

   Tardigrada (Tardigrades)

   Nematoda (Nematodes)

   Annelida (Annelids)

   Mollusca (Mollusks)

   Brachiopoda (Brachiopods)

   Platyhelminthes (Flatworms)

   Nemertea (Ribbon worms)

   Bryozoa (Bryozoans)

 Eukaryota; Opisthokonta; Metazoa; Eumetazoa

 Eukaryota; Opisthokonta; Metazoa