Theodor Eimer

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Gustav Heinrich Theodor Eimer (1843–1898) was a German zoologist.

In 1875, he became a professor of zoology and comparative anatomy at the University of Tübingen.

He is credited with popularizing the term orthogenesis to describe an intrinsic drive in life towards perfection, a form of directed evolution. The "Eimer's organs" found in members of the mole family, especially in the Star-nosed Mole, are named after him. He described these organs in the European mole in 1871. Eimeria, a genus of parasitic protozoa, was also named after him.