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Theodore Edward (Theodor Edvard) Cantor (1809–1860) was a Danish physician, zoologist and botanist.
Cantor worked for the British East India Company. He made natural history collections in Penang and Malacca. In the field of herpetology he described many new species of reptiles and amphibians, including Cantor's giant softshell turtle .
He was the author of
- Notes respecting some Indian fishes (1839)
- General features of Chusan (1842)
- Catalogue of Malayan Reptiles (1847)
- Catalogue of Malayan fishes (1850)