Arthropoda

• Subphylum Trilobitomorpha– Trilobita – trilobites(extinct)

• SubphylumChelicerata– Arachnida – spiders,scorpions,etc.– Xiphosura – horseshoecrabs– Pycnogonida – seaspiders– Eurypterida – seascorpions(extinct)

• SubphylumUniramia– Chilopoda – centipedes– Diplopoda – millipedes

• SubphylumHexapoda– Insecta – insects

• SubphylumCrustacea– Branchiopoda – brineshrimpetc.– Cephalocarida – horseshoeshrimp– Maxillopoda – barnacles,fishlice,etc.– Malacostraca – lobsters,crabs,shrimp,etc.

Head

Thorax

Abdomen