List of arthropod orders

Class Insecta

Order Blattodea – 3,684–4,000

Order Coleoptera – 360,000–400,000

Order Dermaptera – 1,816

Order Diptera – 152,956

Order Embioptera – 200–300

Order Hemiptera – 50,000–80,000

Order Hymenoptera – 115,000

Order Lepidoptera – 174,250

Order Mantodea – 2,200

Order Mecoptera – 481

Order Megaloptera – 250–300

Order Neuroptera – 5,000

Order Notoptera – 30

Order Orthoptera – 24,380

Order Phasmatodea – 2,500–3,300

Order Phthiraptera – 3,000–3,200

Order Plecoptera – 2,274

Order Psocoptera – 5,500

Order Raphidioptera – 210

Order Siphonaptera – 2,525

Order Strepsiptera – 596

Order Thysanoptera – 5,000

Order Trichoptera – 12,627

Order Zoraptera – 28

Class Entognatha

Order Collembola

Order Diplura

Order †Monura

Order Protura

Class Arachnida

Order Acarina

Order Amblypygi

Order Araneae

Order †Haptopoda

Order Opiliones

Order Palpigradi

Order †Phalangiotarbida

Order Pseudoscorpionida

Order Ricinulei

Order Schizomida

Order Scorpiones

Order Solifugae

Order Thelyphonida

Order †Trigonotarbida

Class Merostomata

Order †Eurypterida

Order Xiphosura

Class Pycnogonida Sea spiders

Order Pantopoda

Class Yunnanata †

Order Fuxianhuiida

Class Chilopoda (Centipedes)

Order Scutigeromorpha

Order Lithobiomorpha

Order Craterostigmomorpha

Order Scolopendromorpha

Order Geophilomorpha

Subclass Penicillata

Order Polyxenida

Subclass †Arthropleuridea

Order †Arthropleurida

Order †Eoarthropleurida

Order †Microdecemplicida

Subclass Chilognatha

Order †Zosterogrammida

Infraclass Pentazonia

Order †Amynilyspedida

Superorder Limacomorpha

Order Glomeridesmida

Superorder Oniscomorpha

Order Glomerida

Order Sphaerotheriida

Superorder †Archipolypoda

Order †Archidesmida

Order †Cowiedesmida

Order †Euphoberiida

Order †Palaeosomatida

Order †Pleurojulida

Order Platydesmida

Order Polyzoniida

Order Siphonocryptida

Order Siphonophorida

Superorder Juliformia

Order Julida

Order Spirobolida

Order Spirostreptida

Superfamily Xyloiuloidea † (Sometimes aligned with Spirobolida)

Superorder Nematophora

Order Callipodida

Order Chordeumatida

Order Stemmiulida

Order Siphoniulida

Order Polydesmida

Class Pauropoda

Order Pauropodina

Class Symphyla

No known order, 200 species in 2 families.

Class Arthropleuridea (extinct)

Order Arthropleurida

Order Eoarthropleurida

Order Microdecemplicida

Class Branchiopoda

Order Anostraca

Order Cyclestherida

Order Cladocera

Order Notostraca

Class Remipedia

Enantiopoda †

Nectiopoda

Class Cephalocarida

Order Bracchypoda

Subclass Thecostraca

Order Laurida

Order Dendrogastrida

Order Pygophora

Order Apygophora

Order Kentrogonida

Order Akentrogonida

Order Pedunculata

Order Sessilia

Subclass Tantulocarida

Family Deoterthridae (no order)

Subclass Branchiura

Order Arguloida

Order † Cyclida

Subclass Pentastomida

Order Cephalobaenida

Order Porocephalida

Order Raillietiellida

Order Reighardiida

Subclass Mystacocarida

Order Mystacocaridida

Subclass Copepoda

Order Calanoida

Order Cyclopoida

Order Gelyelloida

Order Harpacticoida

Order Misophrioida

Order Monstrilloida

Order Mormonilloida

Order Platycopioida

Order Poecilostomatoida

Order Siphonostomatoida

Subclass Myodocopa

Order Myodocopida

Order Halocyprida

Subclass Podocopa

Order Platycopida

Order Podocopida

Subclass Eumalacostraca

Superorder Syncarida

Order Anaspidacea Calman, 1904

Order Bathynellacea Chappuis, 1915

Order Palaeocaridacea

Superorder Peracarida

Order Amphipoda

Order Cumacea

Order Isopoda

Order Lophogastrida

Order Mictacea

Order †Pygocephalomorpha

Order Spelaeogriphacea

Order Stygiomysida

Order Tanaidacea

Order Thermosbaenacea

Superorder Eucarida

Order Amphipoda

Order Cumacea

Order Isopoda

Order Lophogastrida

Order Mictacea

Order Mysida

Order †Pygocephalomorpha

Order Spelaeogriphacea

Order Stygiomysida

Order Tanaidacea

Order Thermosbaenacea

Subclass Hoplocarida

Order Stomatopoda

Order Aeschronectida †

Order Palaeostomatopoda †

Subclass Phyllocarida

Order Leptostraca

Order Hymenostraca †

Order Archaeostraca †

Class Trilobite †

Order Agnostida †

Order Asaphida †

Order Corynexochida †

Order Harpetida †

Order Nectaspida †

Order Redlichiida †

Order Lichida †

Order Phacopida †

Order Proetida †

Order Ptychopariida †

Class Megacheira †

Order Leanchoilia †

Order Pectocaridida †

Class Merostomoidea †

Order Limulavida †

Order Emeraldellida †

Class Marrellomorph †

Order Marrellida †

Class Dinocaridida

Order †Radiodonta

Order †Anomalocarididae (?)

Order †Anomalocarididae

Order †Opabiniidae

Order †Opabiniidae (?)