1. Bell ringer 3/3 What makes roundworms different than flatworms?
What advantages do they have over the other?
Would you trade your flatworm child for a roundworm?
Announcements:
Correct your test this weekend if you want to retake next week.

2. Label the round worm on your Webquest note sheet

3. ANNELIDS
Kingdom- Animalia
Phylum- Annelida

4. Characteristics of Segmented Worms
Phylum Annelida
Meaning – anellus = tiny ring
Bilaterial symmetry; coelom; 2 body opening; bodies are cylindrical and segmented
Habitat
Most environments except: frozen soil and dry sand / soil
Locomotion
All use setae (tiny bristles on each segment)

5. Characteristics of Segmented Worms
Reproduction
Hermaphrodites (earthworms and leeches)
Sexual reproduction via mating (bristle worms)
Feeding
Complete digestive track
Eat soil or blood
Significance
Earthworms aerate and fertilize the soil
Leeches are used medically for limb reattachment

6. Characteristics of Segmented Worms
Examples:
Earthworms
Leeches
Bristleworms
Lug worms
Plumed worms
Sea mice
Fan worms

7. Setae
On the outside of each segment, annelids have little bristle-like structures called setae that help them move. Segmented worms also use the setae to help them stay in the soil if a bird gets a hold of them!

8. Segmented Worms
all segmented worms have a body cavity that holds their organs.

9. Earthworms
Earthworms eat soil. They use their crop for storage and their gizzard to grind the soil. Digested food moves to the intestine where it is broken down and absorbed by the blood. Undigested soil and waste leave the worm through the anus.

10. Pictures of Segmented Worms

11. Classes There are three classes of annelids:
Class Polychaeta: marine annelids;
Class Oligochaeta: marine, freshwater and terrestrial annelids including earthworms;
Class Hirudinea: marine, fresh water and terrestrial leeches.

12. The "medicinal leech" feeding on blood from a human arm.
Leeches
Leeches feed on the blood of animals- including humans. They have two suckers that they use to attach to the animal. It will then cut into the flesh and suck out blood. Leeches produce an anesthetic so that the animal doesn’t feel the bite.
For centuries leeches were used for blood letting because of the mistaken belief that bodily disorders and fevers were caused by an excess of blood.
Today leeches are used to keep blood flowing to reattach body parts.
The "medicinal leech" feeding on blood from a human arm.

14. Bell ringer 10/7 Sit with your lab partner.
Read over the list of 20 interesting facts about earthworms.
Identify the 2 that you find the most interesting.

15. Marine Worms
Marine worms also have segments with setae. Some marine worms trap food in tentacles. Others build tubes to hide in.

16. Bell ringer 10/26 We compared 2 worms in lab: planaria & earthworms.
Describe the similarities between the 2 worms.
Describe the differences between the 2 worms.
Pull out all of the following:
unsegmented & segmented worm note sheet.
Worm webquest
Announcements:
Worm quiz tomorrow!!
Clam dissection on Monday?

17. Leech Therapy

18. Bell ringer /27
Complete the flatworm, round worm, and segmented worm rows on your phylum comparison chart.
Announcements:
Worm quiz today!!
Clam dissection on Monday?
Retakes on Sponges & Cnidarian test next week.
Science Club Today! 

19. After the Quiz Put your quiz by the fish.
Start working on the Mollusk reading and coloring guide

20. Worm Review

21. Review Questions
Recall
1. What is cephalization?
2. Name a parasitic flatworm.
3. Name a parasitic segmented worm.
4. Earthworms are in what phylum?
Apply Concepts
5. Are all worms classified into a single phylum?
6. Describe the respiratory system of the flatworms.
7. How does the body plan of the roundworms differ from that of the flatworms?
8. Describe the digestive system of roundworms.
9. What features distinguish Phylum Annelida from the other worms?
10. Describe the skeletal system of a segmented worm.
Critical Thinking
11. Which phylum includes worms with organs that are most similar to the organs found in humans? Support your answer with three pieces of evidence.

23. Closing – Crumble and Toss
Get a piece of paper
How does the structure of the segmented worm affect its function?
Planarian?