Leucoptera sinuella, also known as the scotch bent-wing,[1] is a moth in the family Lyonetiidae.

[1] The larvae have a head and chewing mouthparts with opposable mandibles, and six thoracic and abdominal legs.

[1] A larva forms a large, black-centred blotch on the upper surface of a leaf before mining the leaves of their host plant.

[1][8] The pupae have visible head appendages, wings and legs which lie in sheaths.

Pupation is solitary and external, under a conspicuous white spinning in the shape of the letter "H".