University of Isfahan Taxonomy and Biosystematics 3115-9001 18 68 2026 04 01 Euendemic: a proposed term for complete endemism in biogeographical classification 39 42 30270 10.22108/tbj.2026.148060.1331 EN Farrokh Ghahremaninejad Professor, Department of Plant Sciences, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran Journal Article 2026 01 05 Endemism is a core concept in biogeography, yet terminology describing its different forms remains inconsistent. In particular, no formally defined term exists for taxa whose entire natural distribution is confined to a single geographical or biogeographical unit. This perspective proposes euendemic as a clear and standardized descriptor for complete endemism. The proposed term is strictly spatial and does not imply ecological specialization, evolutionary age, or conservation status. By distinguishing complete endemism from partial forms such as near or subendemism, this contribution aims to improve conceptual clarity and comparability across floristic, biogeographical and conservation studies. Examples from recent regional and global assessments illustrate that complete endemism is already widely applied as an analytical category, despite the lack of an explicit term. Formalizing this condition as euendemic provides a concise vocabulary for a commonly used but previously unnamed concept in biogeography. The proposed terminology is intended for consistent use in floristic checklists, biogeographical syntheses, and conservation assessments. https://tbj.ui.ac.ir/article_30270_2b40ed338b126865ee64e5e4a6456bef.pdf