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TABLE 3.2. Hierarchical Classification of Phylum Arthropoda

—PHYLUM ARTHROPODA—

Subphylum IMarellomorpha

Subphylum Mandibulata

Subphylum Arachnomorpha

Infraphylum Crustaceomorpha

Infraphylum tTrilobita (trilobites)

tMartinssonia et al.

Infraphylum Cheliceriformes

Superclass Crustacea

Superclass tSidneyiida

Epiclass tPhosphatocopida

Superclass tEmeraldellida

Epiclass Eucrustacea

Superclass tSanctacarida

Class Branchiopoda

Superclass Chelicerata

Subclass Sarsostraca

Epiclass Pycnogonida (sea spiders)

Subclass Phyllopoda

Epiclass tAglaspidida

Class Remipedia

Epiclass Euchelicerata

Class Cephalocarida

Class Xiphosura (horseshoe crabs)

Class Maxillopoda

Class tEurypterida (sea scorpions)

Subclass Thecostracaa

Class Arachnida

Subclass tAscothoracida

Subclass Micrura

Subclass tOrstenocarida

Order Palpigradi

Subclass Tantulocarida

Order tHaptopoda

Subclass Branchiura (fish "lice")

Order tTrigonotarbida

Subclass Pentastomida

Order Araneae (spiders)

Subclass tSkaracarida

Order Amblypygida (whip scorpions)

Subclass Mystacocarida

Order Uropygida (vinegaroons)

Subclass Copepoda

Order Schizomida

Class Ostracoda

Order Ricinulei (ricinuleids)

Subclass Myodocopa

Order Acari (mites, ticks)

Subclass Podocopa

Subclass Dromopoda

Class Malacostraca (crabs, isopods, etc.)

Order tPhalangiotarbida

Subclass tNahecarida

Order Opiliones (harvestmen)

Subclass Phyllocarida

Order Scorpiones (scorpions)

Subclass Hoplocarida

Order Pseudoscorpionida

Subclass Eumalacostraca

Order Solfugida (sun scorpions)

Infraphylum Atelocerata (= Tracheata)

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