The strap-shaped terminal part of an insect's labium, typically lobed.
- ‘They transport the spermatophores with a copulatory organ, called the ligula, located on the tip of one of their arms.’
- ‘This individual is a hyolithid without question because both the ligula and the dorsoventral differentiation ordinarily seen in hyoliths are clearly present.’
- ‘Conchs of the Girvan specimens match the diagnostic traits given above in terms of the ligula, aperture and ornamentation on the shell.’
Mid 18th century: from Latin, strap.