Download Annelids

Kingdom Animalia
Phylum Annelida
(segmented worms)
https://www.youtube.com/watch?v=9Q9gh1k99rY
Main Characteristics
segmented worms
true coelom (body cavity)
Annelids
Include:
earthworms
marine worms
leeches
This is a scale worm (Polychaetes).
They live 1000 meters below the
water’s surface and can turn their
mouths inside out.
Other Traits
- Annelida means “little rings”
- body segments separated by septum
= internal wall
-some have bristles called setae
-have closed circulatory system
-have well-developed nervous system (brain)
- sexual reproduction in annelids
- some are hermaphrodites
Class Oligochaeta – Earthworm
• Streamlined bodies for moving through soil
• Few setae, allows for gripping soil
• Live in soil or fresh water
• As earthworms pass food & soil through
intestines, nutrients are absorbed and
indigestible matter passes out through
anus as castings
• Castings - enrich soil, earthworms aerate
soil (worm poop)
https://www.youtube.com/watch?v=ZG4e3uik9uw
Class Hirudinea
-Leeches
-external parasites with suckers on each end
- suck blood & body fluids from host
-most live in moist
tropical habitats
-medicinal uses
(circulation,
anti-clotting)
Leeches being bred for medical uses.
What would you do to cure a swollen foot?
https://www.youtube.com/wat
ch?v=XtpERpBDJtU
Class Polychaeta
Marine worms
-includes:
sandworms,
bloodworms,
fireworms
-have paired
paddle-like
appendages with
setae
Nereis
Featherduster
Fireworm
https://www.youtube.com/wat
ch?v=cdr1kWmSiiE
Recap: Taxonomy
Kingdom Animalia
Phylum Annelida
Class Oligochaeta (earthworms)
Class Hirudinea (leeches)
Class Polychaeta (marine worms)
*All are segmented, and have a coelom