Bashanosaurus primitivus is one of the earliest known stegosaurs and a strong candidate for representing an early form close to the ancestry of later plated dinosaurs like Stegosaurus. It lived roughly 168 million years ago in the Middle Jurassic, long before the classic North American Stegosaurus appeared. It was not necessarily the direct ancestor in a strict family-tree sense, but it sits close enough to the base of the stegosaur branch to work very well as your “proto-stegosaur” anchor.
Bashanosaurus primitivus
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Bashanosaurus primitivus
~168 million years ago.
Stegosaurus ancestor
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Bashanosaurus primitivus is one of the earliest known stegosaurs and a strong candidate for representing an early form close to the ancestry of later plated dinosaurs like Stegosaurus.
Subject: Dinosaur Evolution.
Bashanosaurus primitivus helps us picture an early step in stegosaur evolution. It lived about 168 million years ago in the Middle Jurassic and is one of the oldest known stegosaurs, close to the base of the stegosaur branch. That makes it a strong “proto-stegosaur” anchor for understanding how later plated dinosaurs, including Stegosaurus, emerged over time.
Flashcard.
What primary feature identifies Stegosauria species?.
Answer. Back plates and tail spikes..
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