Taxonomy: Eukaryota-Filozoa-Eumetazoa-Deuterostomia-Chordata-Vertebrata-Gnathostomata-Chondrichthyes-Elasmobranchii-Neoselachii-Selachii-Selachimorpha-Galeomorphi-Lamniformes-Lamnidae-Carcharodon-Carcharodon carcharias

Great white shark *_*

Birth of Jaws: Tiny Fish May Be Ancient Ancestor

The remains of a 415-million-year-old fish skull from Siberia — though miniscule in size — offer hints about the origins of all jawed vertebrates, ranging from reptiles to humans, a new study finds. There are two main types of living jawed vertebrates: those made of bone and those made of cartilage. “It’s a very interesting fossil, and it’s very small,” said Sam Giles, the study’s lead researcher and a paleobiology doctoral candidate at Oxford University in the United Kingdom.