sentence: Some moths have a lobe on the forewing called a 'jugum' that helps in coupling with the hindwing.
sentences_before: Many moths have a 'frenulum' which is a filament arising from the hindwing and coupling with barbs on the forewing. The frenulum can be observed only when a specimen is in hand.
sentences_after: Butterflies however lack these structures.
concept_name: moth
headings: Differences between butterflies and moths Morphological differences Wing coupling mechanisms
categories: Lepidoptera