Franz Kafka, 1915 (carrying into 20th-c canon). Gregor Samsa wakes as an enormous insect.
From Wikipedia
The Metamorphosis, also translated as The Transformation, is a novella by Franz Kafka published in 1915. One of Kafka's best-known works, The Metamorphosis tells the story of salesman Gregor Samsa, who wakes to find himself inexplicably transformed into a huge insect and struggles to adjust to this condition, as does his family. The novella has been widely discussed among literary critics, who have offered varied interpretations. In popular culture and adaptations of the novella, the insect is commonly depicted as a cockroach.