Apex Anatomy Slides
Apex Anatomy
The Secrets of Specialized Teeth
Unit: Ecological Adaptations
Warm-up: Mirror Check
Examine Your Teeth
- Find your Incisors (Front)
- Find your Canines (Pointy)
- Find your Molars (Back)
"Based on your own teeth, what do you think a lion's teeth look like? Draw or describe them on your worksheet."
Case Study: The Lion
Embedded media
Focus Segment
2:53 - 3:29
Key Term
Carnassials
The Goal
Dental Mapping
The Carnivore Toolkit
1. Long Canines
Up to 3 inches long. Used for puncturing and gripping heavy prey.
2. Carnassials
The "back teeth" that act like scissors. They shear meat and bone.
3. Tiny Incisors
Located at the front. Used for scraping meat off bones.
Internal Anatomy
Observe how the teeth do not meet for grinding like humans, but slide past each other for shearing.
Activity: Dentition Detective
Mission Objective:
1
Observe the three mystery skulls labeled A, B, and C.
2
Identify which one is a carnivore, herbivore, and omnivore.
3
Justify your choice using the terms puncturing and shearing.
4
Analyze how these teeth place the animal in the Trophic Pyramid.
FLAT MOLARS
NO CANINES
SKULL A
3" CANINES
SCISSOR-BACKS
SKULL B
POINTY FRONT
FLAT BACKS
SKULL C
Exit Ticket
Final Challenge
"If a lion evolved to eat only grass, how would its teeth need to change?"
Use terms from today: Carnassials, Molars, Incisors, Shearing, Grinding.
Skull Secrets Worksheet
Apex Anatomy
Dentition Detective Laboratory Record
Name:
Date:
PART 1
The Mirror Check
Observe your own teeth in a mirror (or feel them with your tongue). Then, predict the teeth of a lion.
My Observations (Human)
Prediction (Lion Teeth)
PART 2
Video Evidence: Lions
Define: Carnassials
Function of Canines
Function of Carnassials
PART 3
Skull Analysis
| Specimen | Teeth Features (Observe) | Dietary Type |
|---|
| SKULL A | | Circle one: |
| Herbivore / Carnivore / Omnivore | | |
| SKULL B | | Circle one: |
| Herbivore / Carnivore / Omnivore | | |
| SKULL C | | Circle one: |
| Herbivore / Carnivore / Omnivore | | |
Justification: The Lion (Skull B)
Explain how the teeth of Skull B prove it belongs to a high-level carnivore. Use the terms puncturing and shearing in your answer.
PART 4
The Trophic Connection
Based on the dentition (teeth) of Skull B, where does this animal belong on the energy pyramid? Label the levels and place an X where the Lion would sit.
LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4
Evolutionary Shift Exit Ticket
Evolutionary Shift
Exit Ticket
Name
"If a lion evolved to eat only grass, how would its teeth need to change?"
Describe the changes and explain why (use terms like Molars, Shearing, or Grinding).
Scientific Explanation
Sketch of New Teeth
Evolutionary Shift
Exit Ticket
Name
"If a lion evolved to eat only grass, how would its teeth need to change?"
Describe the changes and explain why (use terms like Molars, Shearing, or Grinding).
Scientific Explanation
Sketch of New Teeth
Apex Anatomy Teacher Key
Teacher Guide & Key
Lesson: Apex Anatomy
Answer Key
Part 3: Skull Analysis Key
| Specimen | Correct Identification | Key Markers |
|---|
| SKULL A | Herbivore (e.g., Cow/Deer) | Flat, broad molars for grinding plants. Large gap (diastema) where canines would be. |
| SKULL B | Carnivore (Lion) | Long 3" canines for puncturing. Specialized carnassials for shearing meat. |
| SKULL C | Omnivore (Bear/Human) | A mix: sharp incisors/canines at front, but flattened molars at back for grinding. |
Justification Rubric (Skull B)
- Proficient: Mentions that canines are for "puncturing" or "killing" and carnassials/back teeth are for "shearing" or "cutting like scissors."
- Developing: Mentions the teeth are "sharp" but doesn't use specific anatomical terms or explain the action (shearing/puncturing).
Trophic Placement
Level 4 (Top): Apex Predator (Lion - Skull B)
Level 3: Secondary Consumers (Skull C - often)
Level 2: Primary Consumers (Skull A)
Level 1 (Bottom): Producers (Plants)
Exit Ticket Key
Look for: A shift toward flat molars for grinding fiber. The loss of large canines and the transformation of carnassials into grinding surfaces. Mention of "increased surface area" for breaking down plant cell walls.
Common Misconceptions
Students often think all sharp teeth are for "tearing." Emphasize that carnassials specifically shear (pass each other like scissor blades), while canines puncture. Note that carnivores cannot move their jaws side-to-side for grinding like we can!
