Transcript Phylum Annelida

“Little Rings”
Segmented worms
Tube worms
Leeches
Earthworms
The Facts …
Body symmetryReproductionMovement-
Bilateral
Sexual
muscular contraction
Food- one-way digestive system – Scavengers
 A segment is one of the small divisions on the surface of
the worm
 The average earthworm has about 100 segments.
This is so
embarrassing
The scientific name for earthworm poop is
CASTINGS
Why are Annelids good for our soil?
1. Break down organic matter
2. Make tunnels which help with aeration
and drainage
3. Circulate nutrients in soil
Intestine
Gizzard
Anus
Brain
Clitellum
Crop
Blood vessels
Hearts
Esophagus
Blood vessels
Nerve Chord
Mouth
Segments
Pharynx
Describe how each of these features
help earthworms move through the dirt.
1Bristles- “setae” small hairs on the skin
of worms, which helps them crawl
through the dirt.
2Mucus – outer covering of slime helps
them slide through the dirt and absorb
oxygen.
PHYLUM ANNELIDA
 Segmented worms have a ONE WAY digestive system
 Annelinds blood moves through a “closed” circulatory
system. Which means blood is confined to blood
vessels
 Earthworm need to remain moist at all times because
they absorb oxygen through their skin .