How did the Sacabambaspis soft-shell turtle become extinct?

Sacabambaspis (scientific name: Sacabambaspis, meaning "Armor of Sacabamba") is a jawless fish that lived in the Ordovician period. It inhabits the shallow sea on the edge of Gondwana. A close relative of the Aranda softshell turtle, a famous ancient fish with numerous fossils. At least 30...