Your Inner Fish Chapter 4: “Teeth Everywhere” Abbe Dembowitz AP Bio

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Your Inner Fish
Chapter 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
• 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/fossiliveraci
english/meg,wehardlyknewye
answers.com
Conodonts?
Did you mean: condiments?
• 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
http://dobrinishte.org/fishes/
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…
http://www.nhm.ac.uk/nature-online/species-of-the-day/evolution/index.html
Do they look like this?
..Introduce evolution and….
whyfiles.org
faculty.ksu.edu.sa
kent.ac.uk
Evolution over time
1. Little fish developed
armor
tudorplace.com.ar
2.Big fish obtained
bigger jaws to crack
the armor
• 3. Competition arises
and animals evolve
POPTIMAL.COM
checkyourodds.co.uk
Sources
• Your Inner Fish by Neil Shubin, Vintage
Books, Random House, New York, 2009 (Pgs.
60-80)

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