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“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 .