1. Viewer Discretion Advised: Images to come that may gross you out
Biology 11
Kingdom Animalia:
Phylum Annelida:
The Segmented Worms
Viewer Discretion Advised: Images to come that may gross you out

3. Coelomates
At this point in animal evolution, a true coelom developed. So there is ____________________________ - and __________________________________ - around the skin and the gut
It also marks the point where two great lines of animal evolution diverged: the Protostomes and the Deuterostomes

4. The Protostomes
Contain three major phyla of animals (Annelida, Arthropoda, Mollusca)
While considered less advanced than the Deuterostomes, these phyla are the dominant animals on Earth today

6. Phylum Annelida Objectives
By the end of the lesson you should be able to:
State the advances over Nematodes
Describe all the body systems and structures (specifically on the Earthworm)
Describe the 3 classes and their example animals (and adaptations)

7. Phylum Annelida
The Segmented Worms – From the Latin Annellus ”little ring”
Characteristics and Advances:
1. Their ___________________________results in muscle around the gut and more _____________________________. Specialization of the food tube begins
2. Nervous system has a single ____________________________________with an anterior brain

8. Phylum Annelida
3. First phylum to have a __________________________- frees them from diffusion of materials - can grow larger. Also have “hearts”
4. Respiration through skin (land forms) by diffusion so must stay moist
5. Sexual reproduction (limited regeneration)
6. Unspecialized segmentation separated by __________________________ (dividing wall)

9. Phylum Annelida
7. Have specialized excretory units called ______________in pairs in each segment
Used as a kidney to get rid of metabolic wastes

10. Annelid Classes There are three major classes of Annelids:
Class ____________________: the ___________________
Class ____________________: the ____________________
Class ___________________: the ____________________

11. Class Oligochaeta “few hairs” Contains the earthworm
Move using __________________ (bristles)
Fairly well adapted to land but must stay in moist environment
Head is reduced as are obvious sense organs

13. Class Polychaeta Tube Worms
Contains _____________________that are modified setae
Used as paddles (thus this class is marine) to move about - beginning of appendage development
Also used as crude gills - beginning of respiratory system
Include sandworms and tubeworms
Tube Worms
close up of mouth
Cluster

14. Class Polychaeta
The sandworm shows the parapodia development

15. Class Hirudinea _________________
These are _____________________that feed upon the blood of vertebrates including us.
Most common in fish
Can be used for medical purposes
A leech in a persons eye

18. Annelids Video