List of arthropod orders

Arthropods are invertebrate animals having an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chitin, often mineralised with calcium carbonate. The arthropod body plan consists of segments, each with a pair of appendages. Arthropods are bilaterally symmetrical and their body possesses an external skeleton. In order to keep growing, they must go through stages of moulting, a process by which they shed their exoskeleton to reveal a new one. Some species have wings. They are an extremely diverse group, with up to 10 million species.
Arthropods are invertebrate animals with a chitinous exoskeleton, segmented bodies, and jointed legs. The phylum Arthropoda contains numerous taxonomic orders in over 20 classes.

Subphylum [Hexapoda]

Order Diplura
Order Protura

Class Insecta">Insects">Insecta (Insects)

Subclass [Monocondylia] or Monochlamydia

Order Archaeognatha – 350

Subclass [Dicondylia]

Order †Carbotriplurida
Infraclass Thysanura
* Order Zygentoma – 370
Subclass Pterygota
* Order †Reculida
* Order †Perielytrodea
* Order †Eoblattida
* OrderPanephemeroptera
** Order †Protephemeroptera
** Order †Syntonopterodea
** Order †Permoplectoptera
** Order †Coxoplectoptera
** Order Ephemeroptera – 3,000
* Clade Odonataptera
** Order †Eugeroptera
** Order †Kukaloptera
** Order †Argentinoptera
** Order †Geroptera
** Order †Eomeganisoptera
** Order †Meganisoptera
** Order †Campylopterodea
** Order †Protanisoptera
** Order †Triadophlebioptera
** Order †Protozygoptera
** Order Odonata – 5,900
* Clade Palaeodictyopteroidea
** Order †Palaeodictyoptera
** Order †Permothemistida
** Order †Diaphanopterodea
** Order †Megasecoptera
* Clade Polyneoptera
** Order †Paoliida
** Order †Protorthoptera
** Order †Sheimiodea
** Order Zoraptera – 28
** Order †Archelytroidea
** Order †Protelytroptera
** Order Dermaptera – 1,816
** Order Plecoptera – 2,274
** Order †Caloblattinidea
** Order †Alienoptera
** Order Mantodea – 2,200
** Order Blattodea – 7,400
** Order Grylloblattodea – 34
** Order Mantophasmatodea – 15
** Order Phasmatodea – 2,500–3,300
** Order Embioptera – 200–300
** Order †Chresmododea
** Order †Cnemidolestida
** Order †Titanoptera
** Order †Caloneurodea
** Order Orthoptera – 24,380
* Clade Clareocercaria
** Order †Hypoperlida
** Order †Miomoptera
** Order Psocodea – 11,000
** Order †Permopsocida
** Order Hemiptera – 50,000–80,000
** Order †Lophioneurida
** Order Thysanoptera – 7,700
* Clade Holometabola
** Order Hymenoptera – 115,000
** Order Strepsiptera – 596
** Order Coleoptera – 360,000–400,000
** Order †Glosselytrodea
** Order Raphidioptera – 210
** Order Megaloptera – 250–300
** Order Neuroptera – 5,000
** Order †Protomecoptera
** Order †Tarachoptera
** Order †Permotrichoptera
** Order Lepidoptera – 174,250
** Order Trichoptera – 12,627
** Order †Paratrichoptera
** Order †Protodiptera
** Order Diptera – 152,956
** Order †Paramecoptera
** Order Nannomecoptera
** Order Mecoptera – 481
** Order Neomecoptera
** Order Siphonaptera – 2,525

Class Collembola

Subphylum [Chelicerata]

Class [Xiphosura]

Order Xiphosurida

Class †[Eurypterida]

Order †Eurypterida
Order †Chasmataspidida

Class [Arachnid]a (Arachnids)

Subclass Acari
* Order Opilioacariformes
* Order Ixodida
* Order Holothyrida
* Order Mesostigmata
* Order Trombidiformes
* Order Sarcoptiformes
* Order Endeostigmata
Subclass Arachnopulmonata
* Order Amblypygi
* Order Araneae
* Order †Haptopoda
* Order Palpigradi
* Order †Uraraneida
* Order Schizomida
* Order Pseudoscorpionida
* Order Scorpiones
* Order Uropygi
* Order †Trigonotarbida
Order Opiliones
Order †Phalangiotarbida
Order Solifugae
Order Ricinulei

Class Pycnogonida

Order Pantopoda

Subphylum [Myriapod]a (Centipedes and millipedes)

Class Chilopoda ([Centipede]s)

Class Diplopoda ([Millipede]s)

Subclass [Penicillata]

Order Polyxenida

Subclass Chilognatha

Class [Pauropoda]

Order Hexamerocerata
Order Tetramerocerata

Class [Symphyla]

Order Scolopendrellida
Order Scutigerellida

Subphylum [Crustacea] (Crustaceans)

Order †Henningsmoenicarida
Order †Cambropachycopida
Order †Cambrocarida
Order †Martinssoniida
Order †Phosphatocopida
Order †Bostrichopodida

Class †[Thylacocephala]

Order †Ainiktozoiformes
Order †Concavicarida
Order †Conchyliocarida

Class [Remipedia]

Order †Enantiopoda
Order Nectiopoda

Class [Branchiopoda]

Subclass Sarsostraca
* Order Anostraca
* Order †Lipostraca
Subclass Phyllopoda
* Infraclass Calmanostraca
** Order †Protocaridida
** Order †Kazacharthra
** Order Notostraca
* Infraclass Diplostraca
** Order Laevicaudata
** Order Spinicaudata
** Order Cyclestherida
** Order Anomopoda
** Order Ctenopoda
** Order Haplopoda
** Order Onychopoda

Class [Cephalocarida]

Order Brachypoda

Class [Thecostraca]

Subclass [Ascothoracida]

Order Dendrogastrida
Order Laurida

Subclass [Cirripedia] (Barnacles)

Infraclass Acrothoracica
* Order Cryptophialida
* Order Lithoglyptida
Infraclass Rhizocephala
Infraclass Thoracica
* Superorder Phosphatothoracica
** Order Iblomorpha
** Order †Eolepadomorpha
* Superorder Thoracicalcarea
** Order Calanticomorpha
** Order Pollicipedomorpha
** Order Scalpellomorpha
** Order †Archaeolepadomorpha
** Order †Brachylepadomorpha
** Sessilia
*** Order Balanomorpha
*** Order Verrucomorpha

Class [Hexanauplia]

Subclass [Copepod]a (Copepods)

Infraclass Progymnoplea
* Order Platycopioida
Infraclass Neocopepoda
* Clade Gymnoplea
** Order Calanoida
* Clade Podoplea
** Order Canuelloida
** Order Cyclopoida
** Order Gelyelloida
** Order Harpacticoida
** Order Misophrioida
** Order Monstrilloida
** Order Mormonilloida
** Order Siphonostomatoida

Class [Ichthyostraca]

Subclass [Branchiura]

Order Arguloida
Order †Cyclida

Subclass [Pentastomida]

Order Cephalobaenida
Order Porocephalida
Order Raillietiellida
Order Reighardiida

Class [Mystacocarida]

Order Mystacocaridida

Class [Ostracod]a (Ostracods, or seed shrimp)

Order †Eridostracoda

Subclass †[Leperditicopa]

Order †Leperditicopida

Subclass †[Leiocopa]

Order †Leiocopida

Subclass [Palaeocopa]

Order Palaeocopida

Subclass [Myodocopa]

Order Myodocopida
Order Halocyprida

Subclass [Podocopa]

Order Platycopida
Order Podocopida

Class [Malacostraca] (Malcostracans, such as crabs and lobsters)

Subclass [Eumalacostraca]

Superorder Syncarida
* Order Anaspidacea Calman, 1904
* Order Bathynellacea Chappuis, 1915
* Order †Palaeocaridacea
Superorder †Eocarida
* Order †Eocaridacea
* Order †Pygocephalomorpha
Superorder Peracarida
* Order Amphipoda
* Order Cumacea
* Order Isopoda
* Order Lophogastrida
* Order Mictacea
* Order Mysida
* Order Spelaeogriphacea
* Order Stygiomysida
* Order Tanaidacea
* Order Thermosbaenacea
Superorder Eucarida
* Order Decapoda
* Order Euphausiacea
* Order †Angustidontida

Subclass [Hoplocarida]

Order Stomatopoda
Order †Aeschronectida
Order †Palaeostomatopoda

Subclass [Phyllocarida]

Order ?†Discinocarida
Order †Archaeostraca
Order †Hoplostraca
Order Leptostraca

Subphylum †[Artiopoda]

no class

Order †Emeraldellida
Order †Cheloniellida
Order †Sidneyiformes
Order †Agnostina

Class †[Protosutura]

Order †Acanthomeridiida

Class †[Aglaspida]

Order †Aglaspidida
Order †Strabopida

Class †[Trilobita]

Subclass †Petalopleura">Xandarellida">Petalopleura

Order †Sinoburiida
Order †Xandarellida

Subclass †[Nectopleura]

Order †Nectaspidida

Subclass †[Conciliterga]

Order †Helmetiida †

Subclass †[Trilobita]

Order †Eodiscina
Order †Olenellina
Order †Asaphida
Order †Aulacopleurida
Order †Corynexochida
Order †Harpetida
Order †Redlichiida
Order †Lichida
Order †Phacopida
Order †Proetida
Order †Ptychopariida

Other classes

no class

Order †Isoxyida
Order †Hymenocarina
Order †Mollisoniida
Order †Bradoriida
Order †Burgessiida
Order †Fuxianhuiida
Order †Habeliida

Class †[Megacheira]

Order †Leanchoiliida
Order †Yohoiida

Class †[Marrellomorpha]

Order †Acercostraca
Order †Marrellida

Class †[Dinocaridida]

Order †Radiodonta
Order †Opabiniida

Class †[Euthycarcinoidea]

Order †Euthycarcinida