part of develops from adult head bristle vertical bristle https://www.ento.csiro.au/biology/drosophila/melanogaster.html?vertical%20setae FBbt:00004121 vertical seta Bristle of the posterior dorsal head, close to the eye (Eichler et al., 2024). There are usually four of these on each side, two larger and two smaller (Eichler et al., 2024). Vt bristle Previously only comprised the two large vertical bristles, but two additional smaller bristles identified by Eichler et al. (2024). fly_anatomy.ontology VFB:FBbt_00004121 macrochaeta vertex presumptive vertical bristle