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Worms. Invertebrates Bilateral Symmetry Simplest animal with a brain Have long, narrow bodies without legs. Flatworms Phylum: Platyhelminthes. All are flat & soft as jelly Many are parasites (it lives on or inside another organism called a host)
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Worms Invertebrates Bilateral Symmetry Simplest animal with a brain Have long, narrowbodies without legs
FlatwormsPhylum: Platyhelminthes All are flat & soft as jelly Many are parasites (it lives on or inside another organism called a host) Some arefree-living (it does not live in or on another animal) • Ex) Planarian- free living scavenger found • in ponds and streams • It inserts a feeding tube & digestive juices into its food then sucks it up. They rely on smell to find food • Ex)Tapeworm- parasite that lives inside • an animal’s intestines • Its flat body absorbs nutrients from the host’s intestines
RoundwormsPhylum: Nematoda They have cylindrical bodies They have a 1-way digestive system- a tube open at both ends that contains a mouth and an anus Can be found in any moist environment Some are free-living, some are parasites
Round worm Intestinal parasites
Segmented WormsPhylum: Annelida They have a series of rings separated by grooves or segments They have organs such as a heart, brain, nerve cord, intestines, etc They have a closed circulatory system- where blood moves through vessels Ex) Earthworm Ex) Leech
