alternative definition added over 13 years ago by Istvan Miko
The longitudinal ridge(s) sometimes present on the median portion of the clypeus.
Reference: Leponce, M., T. Delsinne , Y. Laurent, J. Cillis, I. Bachy, A. Heughebaert, P. Desmet, and N. Youdjou. 2010. RBINS Ant eMuseum Paraguay Collection Glossary. Availble at http://projects.biodiversity.be/ants/.
Cross reference:
None provided.