Wilhelm Michaelsen
Johann Wilhelm Michaelsen was a German zoologist who was a world authority on the Oligochaeta which includes the earthworms. He named and described more than a thousand new species.
Michaelsen was born to Friedrich Rudolph and Johanna Catharina Ferdinandine née Köhn. In 1887 he commenced work at the Hamburg Zoological Museum, at first as a research assistant. He was later to become Hauptkustus. Alfred Lothar Wegener was a friend of Michaelsen and made use of his biogreographical work for some of his ideas on plate tectonics. Michaelsen named a species of earthworm after him as Wegeneriella Michaelsen, 1933. He also collaborated with John Stephenson.
Though he also worked in the study of Tunicates and Polychaetes, Michaelsen was best known for his work on Oligochaeta. To that end, he travelled to southern regions of South America, Africa and Australia to investigate the fossil records of ancient Oligochaete distribution.
Michaelsen was married to Agnes Huwald and they had no children.
Michaelsen is commemorated in the scientific name of a species of lizard, Strophurus michaelseni.
