part_of part of part of only in taxon only_in_taxon develops from develops from composed primarily of chitin Arthropoda chitin-based cuticle uberon MIAA:0000150 UBERON:0001001 A cuticular covering that is composed primarily of chitin. The main structural component of arthropod cuticle is a polysaccharide, chitin, composed of N-acetylglucosamine units, together with proteins and lipids[WP]. Wikipedia:Arthropod_exoskeleton EFO:0000944 HAO:0000240 MAT:0000150 cuticle integumental system ectoderm-derived structure outer epithelium chitin-based acellular structure