Monday, August 22, 2011


Coccosteus is a Devonian arthrodire placoderm that resembles the larger Dunkleosteus. Coccosteus mainly lived in fresh water, but could have possibly also lived in the sea, like a bull shark in reverse. Fossils of Coccosteus have been found in Europe and North America.

Coccosteus was usually about 8 to 10 inches, but the largest specimen is 16 inches long. Its name means "seed bone."

Like all other arthrodires, Coccosteus had a joint in its neck that would have allowed it to open its mouth wider than most fish and swallow larger prey. Coccosteus had a sharp beak which would have helped it slice open prey. It had bony plates covering its head which could have protected it from predators.

Coccosteus lived from the middle to late Devonian Period.


  1. This reminds me of my favorite fish, the coelacanth:

  2. I might post a species of coelacanth on my blog, and I do have a picture of me posing with a dead coelacanth preserved in a tank of liquid.

  3. Armored fish not only look cool, they help us understand how our skeletons evolved. Our skulls and even the enamel in our teeth seem to be evolved from those bony plates (dermal skeleton) covering this guy's head...


  4. @Allison M.: I didn't know that! It *is* cool.