Karl Theodor Ernst von Siebold, German physiologist and zoologist (born 1804)

Karl Theodor Ernst von Siebold

German physiologist and zoologist (1804–1885)

Prof Karl (Carl) Theodor Ernst von Siebold FRS(For) HFRSE was a German physiologist and zoologist. He was responsible for the introduction of the taxa Arthropoda and Rhizopoda, and for defining the taxon Protozoa specifically for single-celled organisms.