What is Petalodontidae?
'''Petalodontidae''' is an extinct [[Family (biology)|family]] of [[cartilaginous fish]] related to the modern-day [[Chimaera (fish)|chimaera]], found in what is now the [[United States|United States of America]] and [[Europe]]. With a very few exceptions, they are known entirely from [[Tooth|teeth]]. Petalodontids belong to the order [[Petalodontiformes]], an order of [[prehistoric fishes]]. Petalodontidae is the most popular family of the [[Petalodontiformes]]. The type genus is ''[[Petalodus]]''. [[Category:Extinct fish]] [[Category:Cartilaginous fish]]