Arthropods

Arthropods ( ) are invertebrates in the phylum Arthropoda. They possess an exoskeleton with a cuticle made of chitin, often mineralised with calcium carbonate, a body with differentiated (metameric) segments, and paired jointed appendages. 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. They form an extremely diverse group of up to ten million species.

thumb|Scutigera coleoptrata

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thumb|Microarthropods Microarthropods (from Micro… and Arthropods) are a special size group of small invertebrates of the phylum arthropods. Their sizes (usually from one to several millimeters) determine their habitats (usually soils), ecological features and methods of study.