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worms. By: Jensine Goudy and Sarah Easterday. Flatworms. Phylum name: Platy helminthes 20,000 species Bilateral symmetry Simplest animals to have 3 tissue layers Complex body structure; enables movement Produce eggs Tapeworms absorb nutrients across their body surface.
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worms By: Jensine Goudy and Sarah Easterday
Flatworms • Phylum name: Platy helminthes • 20,000 species • Bilateral symmetry • Simplest animals to have 3 tissue layers • Complex body structure; enables movement • Produce eggs • Tapeworms absorb nutrients across their body surface
example: Tapeworms Above is the head of a tapeworm.
Roundworms • Phylum name: Nematode • 15,000 species • Small and cylindrical, with pointed heads and tapered tails • 3 tissue layers • Complete digestive tract with two openings
example: rotifers below is shown a parasitic roundworm.
Segmented Worms • Phylum name: Annelida • 15,000 species • All body segments are very similar • 3 tissue layers • Bilaterally symmetrical • Digestive tract penetrates segment walls and runs the length of the animal
Examples: earthworms, parasitic leeches Above is a picture of earthworms.
Fun Facts • A worm has no arms, legs, or eyes. • The largest earthworm ever found was 22 feet long! • Each worm has both female and male organs. • Worms can eat their weight each day. • Worms have between 1 and 5 pairs of hearts. • Earthworms use their skin to breathe. • Worms live about 3 to 4 years.
