Final answer:
The five survivors in the foundational myth of Thebes were called the Sparti. They were grown from the serpent's remains and had hearts of stone.
Step-by-step explanation:
The five survivors that formed the leading families of Thebes in its foundational myth were called the Sparti. They were grown from the serpent's remains and were considered to have hearts of stone. The Sparti played a significant role in the history and founding of the city of Thebes.