Your Inner FishChapter 4: “Teeth Everywhere”

Abbe Dembowitz

AP Bio

9/14/10

You might’ve thought that she introduced teeth to the world…

peelinganorangewithascrewdriver.blogspot.com

…but you were sadly mistaken…

The harder the tooth, the better the fossil

answers.com

• Rocks and teeth: preservation wise, they’re one in the same

• “Bigger creatures into smaller pieces”

• Eating Habits:

•Carnivores- Sharp blades

•Herbivores- flat, square

http://sites.google.com/site/fossiliveracienglish/meg,wehardlyknewye

Conodonts?Did you mean: condiments?

http://dobrinishte.org/fishes/

• Fossils found in ancient oceans

• “small shelly organisms with a series of spikes projecting out of them,” (75)

• The lamprey

• The evolved jaw and Trithelodont

•Single root at base of tooth: reptile

•Bumps and ridges- mammal

eeob.iastate.edu

“We would never have scales, feathers, and breasts if we didn’t have teeth in the first

place,” (79)

cartoonstock.com

• “The developmental tools that make teeth have been repurposed to make other important skin structures” (80)

•Teeth: Development b/w layers of tissue in skin

•Other: Development from the interactions b/w layers of skin

•Acquiring of their prey

Take a look at your teeth…

Do they look like this?

..Introduce evolution and….

whyfiles.org faculty.ksu.edu.sa kent.ac.uk

http://www.nhm.ac.uk/nature-online/species-of-the-day/evolution/index.html

Evolution over time

1. Little fish developed armor

2.Big fish obtained bigger jaws to crack the armor

• 3. Competition arises and animals evolve

tudorplace.com.ar

POPTIMAL.COM checkyourodds.co.uk

Sources

• Your Inner Fish by Neil Shubin, Vintage Books, Random House, New York, 2009 (Pgs. 60-80)