We are pleased to announce the symposium "Tracing Evolution through Cell Lineages", which will take place 12-14 October 2026 at the Max Planck Institute for Evolutionary Biology in Plön, Germany. This workshop aims to bring together researchers at the interface of evolutionary, developmental, and stem cell biology to explore how evolutionary change is mediated through cell lineages. While phenotypic evolution is often studied at the level of whole organisms, this symposium focuses on the cellular processes cell states, lineage architecture, fate decisions, and dynamics that ultimately generate morphological and functional diversity. Particular emphasis will be placed on how changes in lineage topology, timing, and spatial deployment contribute to the emergence of novel cell types and to phenotypic diversification across and within taxa. The workshop will begin with a kick-off session on the evening of Monday, October 12, followed by two full thematic days. The second day will focus on how cellular processes underpin phenotypic change, while the third day will emphasize the evolution and diversification of cell types and lineages. The program will include invited speakers, contributed talks, a poster session, structured discussions, and ample time for informal exchange. Invited speakers include: Gunther Wagner Athanasia Tzika Leslie Babonis Alexa Sadier Henrik Kaessmann Detlev Arendt Patrick Tschopp Andrea Streit Arnau Sebé-Pedrós We welcome contributions from researchers working within this framework. Participants may present their work as a poster or be considered for a short talk. Register here: https://workshops.evolbio.mpg.de/event/145/overview With kind regards, the organizing committee: Gianmarco Cavalli, Nathalie Feiner, Linda Kappes, Markéta Kaucka, Robin Pranter Robin Pranter (to subscribe/unsubscribe the EvolDir send mail to golding@mcmaster.ca)