in taxon Eumetazoa acellular anatomical structure cuticle Tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Cuticles are non-homologous, differing in their origin, structure and chemical composition[WP]. BTO:0001600 cuticular exoskeleton cuticular cuticula EDITOR_NOTE TODO - check cuticle vs exoskeleton. Note that GO has a very generic definition of cuticle. See also arthropod-anatomy ontology. Note in ncit Cuticle is a plant part Wikipedia:Cuticle UBERON:0001002 eponychium