According to my files from many years ago, my first contact with Denis Lynn dates back to February 1974, when he sent me a letter with questions related to extrusomes in ciliates, the topic of my doctoral thesis. Denis was in the completion phase of his PhD thesis (Figure 1) and I had just started my first position as Assistant Professor at the University of Heidelberg. Later, Denis and I met from time to time on the occasion of international congresses of protozoology. Additionally, over the years we developed a lively correspondence about ciliatological problems.

When in the early 1980s I began to think about editing a monograph with the title Ciliates: Cells as Organisms, the first colleague whom I approached with a request to compose a chapter on ciliate systematics was Denis. Without any hesitation, he agreed to be one of...

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