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.

Class Insecta (Insects)

Subclass Monocondylia or Monochlamydia

Subclass Dicondylia

Class Collembola

Class Xiphosura

Class †Eurypterida

Class Arachnida (Arachnids)

Class Pycnogonida

Class Chilopoda (Centipedes)

Class Diplopoda (Millipedes)

Subclass Penicillata

Subclass Chilognatha

Class Pauropoda

Class Symphyla

Class †Thylacocephala

Class Remipedia

Class Branchiopoda

Class Cephalocarida

Class Thecostraca

Subclass Ascothoracida

Subclass Cirripedia (Barnacles)

Subclass Facetotecta

Class Hexanauplia

Subclass Copepoda (Copepods)

Class Ichthyostraca

Subclass Branchiura

Subclass Pentastomida

Class Mystacocarida

Class Ostracoda (Ostracods, or seed shrimp)

Subclass †Leperditicopa

Subclass †Leiocopa

Subclass Palaeocopa

Subclass Myodocopa

Subclass Podocopa

Class Malacostraca (Malcostracans, such as crabs and lobsters)

Subclass Eumalacostraca

Subclass Hoplocarida

Subclass Phyllocarida

no class

Class †Protosutura

Class †Aglaspida

Class †Trilobita

Order Retifaciida

Subclass †Petalopleura

Subclass †Nectopleura

Subclass †Conciliterga

Subclass †Trilobita

no class

Class †Megacheira

Class †Marrellomorpha

Class †Dinocaridida

Class †Euthycarcinoidea

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