Dr. ir. Jacobus Johannes (John) van Aartsen (1936-2020) en Jozina Magdalena van Aartsen - van der Molen (1938-2020)

John van Aartsen and his wife Jozina van Aartsen-van der Molen passed away on 26 March, 2020. As of 1958 John had a keen interest in molluscs of the Mediterranean, and particularly the differences in malacofauna of the western and eastern parts of that basin. He focussed on Rissoidae, Pyramidellidae and bivalves; published many papers and described 105, particularly small, species. Together with his wife Jozina many trips were devoted to the collection of samples potentially containing small shell species. His collection with an odd 33,000 samples has been included in that of Naturalis Biodiversity Center.