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Humans can grunt, Bears can grunt, but Worm Grunting? “Little Rings” Segmented worms Tube worms Leeches Earthworms The Facts … Body symmetryReproductionMovement- Bilateral Sexual muscular contraction Food- Scavengers that have a one-way digestive system 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 Mouth Clitellum Crop Blood vessels Hearts Esophagus Blood vessels Nerve Chord 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. 2Mucous – 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 . Fascinating Annelida Facts Doctors can use leeches to help suck the blood from surgical wounds and help people heal faster! Tube worms live deep under the ocean, getting all of their energy from hydrothermal vents in the Earth’s crust. Worm grunting is a competitive sport where people make vibrations on the ground and encourage worms to come to the surface!