Arthropod

Arthropoda
	Centipede
Biological classification
Kingdom:	Animalia;
Phylum:	Arthropoda;
Classes
	Subphylum Trilobitomorpha Trilobita - trilobites (extinct); ; Subphylum Chelicerata Arachnida; Merostomata; Pycnogonida; ; Subphylum Myriapoda Chilopoda; Diplopoda; Symphyla; Pauropoda; ; Subphylum Hexapoda Insecta; Entognatha; ; Subphylum Crustacea Branchiopoda - tadpole shrimps; Remipedia; Cephalocarida; Maxillopoda - barnacles; Ostracoda; Malacostraca; ;

Arthropods (phylum Arthropoda) are a group of invertebrates, which means they do not have backbones (vertebrae). Insects, spiders, crabs, shrimp, millipedes, and centipedes are all arthropods.

Arthropods are also a source of food for many animals, including humans. All arthropods have jointed feet, a segmented body, and an exoskeleton, a shell outside of the body.

Arthropods are made up of 4 groups of living animals and one group of extinct animals. The 4 groups are insects, arachnids, crustaceans, and myriapods. The trilobites are extinct, and they are the second most famous type of fossils, after the dinosaurs.