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SHELLS

The “shells” or exoskeletons of arthropods, including insects, spiders, and crustaceans like lobsters and crabs, are made of chitin. Chitin is comprised of polysaccharides, which also form the walls of fungi and some bacteria.
 

Insects
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Hexapoda
(unranked): Ectognatha
Class: Insecta
Crustaceans
Kingdom: Animalia
Phylum: Arthropoda
Clade: Pancrustacea
Subphylum: Crustacea
 
Spiders
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae