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*Placodermi* is an extinct class of armored prehistoric fish. These fish lived during the Devonian period, often called the "Age of Fishes." They were among the first jawed vertebrates, possessing bony plates covering their bodies. They were very diverse, with a variety of forms and sizes. They represent an important stage in the evolution of jawed vertebrates. They are like the ancient tanks of the sea!
The name *Placodermi* comes from the Greek words *plakos* meaning "plate" and *derma* meaning "skin." This name refers to the characteristic bony plates that covered their bodies. The etymology accurately describes this main feature. It helps in remembering their distinctive characteristic.
Think of *Placodermi* as the dinosaurs of the sea, but way older and covered in plates instead of scales. They ruled the oceans before the dinosaurs roamed the earth. If you ever see a depiction of the Devonian period, expect to see these armored fish!
Impress your paleontology teacher with your knowledge of *Placodermi*! Understanding extinct species is crucial for understanding evolution. Add this word to your vocabulary and become a fossil expert! ðĶī
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