In tribute to our beloved friend and founding Editor-in-Chief, Dr Terry Erwin, who passed away on 11^th May 2020, we are planning a special memorial volume to be published on 11 May 2021, the date Terry left us. Terry will be remembered by all who knew him for his radiant spirit, charming enthusiasm for carabid beetles and never-ceasing exploration of the world of biodiversity! 

In recognition of the love and devotion that Terry expressed for study of the World's biodiversity, ZooKeys invites contributions to this memorial issue to all subjects falling within the area of systematic zoology. Of special interest would be papers recognising Terry's dedication to collection based research, massive biodiversity surveys and origin of biodiversity hot spot areas.

Article processing charges (APCs) will be waived for: (1) Contributions to systematic biology and diversity of carabid beetles, (2) Contributions from Terry’s students and (3) Contributions from his colleagues from the Smithsonian Institution. The APC for articles which do not fall in the above categories will be discounted at 30 %.

The submission deadline is 31^st of December 2020.

Contributors are also invited to send memories and photos which shall be published in a special addendum to the volume.

The memorial volume will also include a joint project of Plazi, Pensoft and the Biodiversity Literature Repository aimed at extracting of taxonomic data from Terry Erwin’s publications and making it easily accessible to the scientific community.