author
1833–1911
A 19th-century German naturalist and prolific writer on mollusks, remembered for helping document freshwater snails and other shells in careful detail. His work still surfaces in the history of malacology and old scientific literature.

by C. (Carl Heinrich) Apstein, Friedrich Borcherding, Stephan Clessin, Paul Kramer, E. Schmidt-Schwedt, Arthur Seligo, Friedrich Zschokke
Born in Würzburg in 1833 and later associated with Regensburg, Stephan Clessin was a German naturalist best known for his work in malacology, the study of mollusks. Library and authority records identify him as having lived from November 13, 1833, to December 21, 1911.
Clessin wrote extensively about snails and related species, especially freshwater mollusks. His books and scientific writings were part of the energetic 19th-century effort to classify and describe the natural world, and his name remains familiar to readers of older zoological and conchological literature.
Although easily overlooked outside specialist circles today, he represents the kind of careful scholar whose observations helped build the foundations of modern species study. For listeners interested in the history of natural science, his work offers a window into how Victorian-era researchers described living things with patience and precision.