The malacological world has suffered a great loss. Adrianus Willem Janssen, better known as Arie W. Janssen, Nestor of research in the Netherlands on fossil and extant molluscs, passed away in the night of August 6, 2021, at the age of 84 (Fig. 1). During the last few months of his life, his physical condition had been rapidly deteriorating; despite this, until just a few days before his demise, he continued to work on pending publications with zeal and a clear mind, as ever.

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Cainozoic research

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Werkgroep voor Tertiaire en Kwartaire Geologie

Jaap van der Voort, John W.M.Jagt, Katja T.C.A. Peijnenburg, Ronald Pouwer, Han (J.G.M.) Raven, & Frank P. Wesselingh. (2021). In memoriam: Adrianus Willem (Arie W.) Janssen (1937–2021). Cainozoic research, 21(2), 113–146.