To what extinct family did Archelon belong?
Answer
Protostegidae
Archelon is classified within the extinct family Protostegidae, which took an evolutionary path toward gigantism that did not survive the mass extinction.

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Related Questions
Which measurement best reflects the maximum estimated length of an Archelon from head to tail tip?During which geological period did Archelon live?To what extinct family did Archelon belong?What was a distinguishing feature of Archelon's shell (carapace) compared to many modern turtles?Where are fossils of Archelon primarily found today?What specific type of prey did Archelon's specialized jaw structure suggest it preferred?What event marked the end of Archelon's existence?How did the fore-flippers of Archelon compare in size to the entire carapace length of a modern Leatherback?What is the primary reason paleontologists dismiss modern sighting claims of Archelon?How does the carapace length of Archelon compare to the Leatherback, the largest existing marine turtle?