Acanthodii
| The spiny sharks, one of the five classes of fishes, now extinct. They were about 10–30 cm/4–12 in long, and possessed features of both the sharks, which have a cartilaginous skeleton, and the bony fish, which have a bony skeleton. They are the earliest known jawed vertebrate animals. |
How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
| ?Page tools | ||
|---|---|---|
|
?Sign in  |
|---|