We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleThe insect upper lip (labrum) is a nonsegmental appendage-like structure.AuthorsPosnien, Nico; Bashasab, Fakrudin; Bucher, GregorPublicationEvolution & Development, 2009, Vol 11, Issue 5, p480ISSN1520-541xPublication typearticleDOI10.1111/j.1525-142X.2009.00356.x