Head, ventral view; scale bar 100 mm (VIDEO) Cell Press This video is under embargo. Please login to access this video. Caption Head, ventral view; scale bar 100 mm Credit Current Biology/Azar et al. Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.