Which daughter of Phorcys and Ceto was decapitated by Perseus?

The correct answer is Medusa, who is indeed the daughter of Phorcys and Ceto. In Greek mythology, Perseus was tasked with slaying Medusa, one of the three Gorgon sisters, who was uniquely mortal compared to her immortal siblings, Stheno and Euryale. Medusa was known for her hair made of living snakes and the ability to turn anyone who gazed upon her into stone. Perseus received divine assistance, including a reflective shield from Athena, which allowed him to approach Medusa without directly looking at her, ultimately leading to her decapitation.

In contrast, Scylla, another daughter of Phorcys and Ceto, is a sea creature known for her terrifying form and her role in the Odyssey, but she was not encountered by Perseus. Stheno is one of Medusa's immortal sisters and was not directly involved in the story of Perseus. Echidna, often referred to as the "Mother of Monsters," is a different mythological figure entirely, known for her numerous offspring that include various monstrous beings in myths, and did not involve herself in the tale of Perseus. Thus, the significant event of Medusa's decapitation by Perseus is a key