Johann Kaspar Füssli

{{Short description|Swiss entomologist (1743–1786)}}

Image:Johann Kaspar Füssli.gif

Johann Kaspar Füssli, also written Johann Caspar Fuesslin, or Fuessly (9 March 1743 – 4 May 1786), was a Swiss painter, entomologist and publisher.

He was born in Zurich, the son of Johann Caspar Füssli (1706–1782) and Anna Elisabeth Waser. He was thus the brother of Henry Fuseli (Johann Heinrich Füssli, 1745–1825).

He married twice: to Verena Störi in 1770, and Anna Elisabeth Kilchsperger in 1774.

The only spider species he described (as Fuesslin, 1775) that is accepted {{As of|2025|February|lc=yes}} is the "daddy long-legs spider", Pholcus phalangioides, also known as the "cellar spider", which he called Aranea phalangoides.{{cite web |title=Taxon details Pholcus phalangioides (Fuesslin, 1775) |work=World Spider Catalog |publisher=Natural History Museum Bern |url=https://www.wsc.nmbe.ch/species/26587 |access-date=2025-02-26 }} Aranea longipes, which he described in the same work, is now considered to be synonym of Tegenaria domestica, first described by Carl Alexander Clerck in 1757.{{cite web |title=Taxon details Tegenaria domestica (Clerck, 1757) |work=World Spider Catalog |publisher=Natural History Museum Bern |url=https://www.wsc.nmbe.ch/species/1088 |access-date=2025-02-26 }}

He died, aged 43, in Winterthur.