has part has part has_part posterior to cuticle of insect thorax cuticle of insect abdomen Abdomen The region of the cuticle that is posterior to the thorax. The thorax is defined based on local properties (e.g. attachment sites of coxal muscles) and therefore we can reference this class for the definition of the abdomen. region of cuticle preabdomen postabdomen insect tagmatic subdivision of integument