In October 1666, Nicolaus Steno dissected the head of a great white shark and found that each jaw contained 13 rows of teeth.
Sources
- Nicolaus Steno (1638-1686) - NASA Science (science.nasa.gov)
- https://anatomists.substack.com/p/the-anatomist-who-invented-geology (anatomists.substack.com)
- https://www.biblio.com/book/elementorum-myologiae-specimen-seu-musculi-descriptio/d/865235586 (biblio.com)
- https://www.forbes.com/sites/davidbressan/2016/01/14/how-the-dissection-of-a-sharks-head-revealed-the-true-nature-of-fossils/ (forbes.com)