[Ancient Helmet-Wearing Wormy Creature Was Covered in 'Cocktail Sticks'] About 515 million years ago, a tiny sea critter that…
[雲南澄江發現五億多年前帶刺及背甲的生物化石] [Ancient Helmet-Wearing Wormy Creature Was Covered in 'Cocktail Sticks'] About 515 million years ago…