Dear Colleagues, We are pleased to inform you that the abstract submission is open for the 20th International Congress of the International Union for the Study of Social Insects (IUSSI), which will be held in Freiburg, Germany, from 16 to 20 August 2026. This congress is a premier gathering for researchers and scholars focused on the study of social insects, including ants, bees, wasps, and termites. It offers a unique opportunity to share the latest research, foster interdisciplinary collaborations, and engage with leading experts in the field. Deadlines: - Abstract submission for posters and talks: 31 December 2025 - Early bird registration: 15 February 2026 For more information on symposia, travel, and the scientific program, please visit the official conference website: https://iussi2026.org/ We encourage you to mark your calendars and plan to join us for this exciting event. We look forward to welcoming you to Freiburg in 2026! Best regards, The IUSSI 2026 organizing committee Volker Nehring (to subscribe/unsubscribe the EvolDir send mail to golding@mcmaster.ca)