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The Worms
Phylum Platyhelminthes
Phylum Nematoda
Phylum Annelida
Phylum Platyhelminthes = Flatworms
Ganglia
Special Structures:
Ganglia
Flame Cells
Pharynx
–- group
Food
- specialized
isofdrawn
nerve through
cells
cells
Eye spot
thisthat
tuberemove waste
Nerve cord
materials
Gastrovascular
cavity
Flame cells
Pharynx
Mouth
Phylum Platyhelminthes = Flatworms
Body symmetry: Bilateral
Body cavity: acoelomate
Respiratory, Circulatory: diffusion
Excretory: flame cells
Phylum Platyhelminthes = Flatworms
Response: ganglia (simple)
Feeding: carnivores or parasitic
Movements: Cilia and muscle cells
Reproduction: sexual (hermaphroditic)
P2 = slate
Write down 2 questions about phylum
platyhelminthes that might be asked on a
test. (leave space for an answer)
Trade slates with a partner and answer the
questions they wrote.
Phylum Platyhelminthes = Flatworms
Examples: Planaria, Fluke, Tapeworm
Tapeworms
The largest tapeworms can grow up to 58ft
long
You can become contaminated by eating
infected food
They harm what they are living in by
stealing vital nutrients. (House episode)
Flukes
Humans ingest the eggs of flukes by
eating raw fish, or eating the plant stalks of
bamboo or other things that grow in a
moist fresh water.
Most common in Asia
Phylum Nematoda = Round Worms
Retract piercing
device
Special Structures:
Dioecious
Hydrostatic
Sense organs
- skeleton
each
- neuron
organism
- layers
thatisof
only
circular
reacts
one
toand
sex;
a specific
longitudinal
separate
stimulus,
sexes
muscles,
such as light
together with the
water in the gastrovascular
cavity, that enable movement
anus
mouth
pharynx
intestine
pseudocoelom
Phylum Nematoda = Round Worms
Body symmetry: Bilateral
Body cavity: Pseudocoelomates
Respiratory, Circulatory, Excretory: diffusion
Response: ganglia (simple), sense organs
(detect chemicals)
Phylum Nematoda = Round Worms
Feeding: parasitic
Movements: muscles, hydrostatic skeleton
Reproduction: sexual  dioecious
P2 = slate
Write down 2 questions about phylum
nematoda that might be asked on a test.
(leave space for an answer)
Trade slates with a partner and answer the
questions they wrote.
Phylum Nematoda = Round Worms
Examples: trichinosis, filarial worms,
Ascaris, hookworms
Trichinosis
Caused by eating raw pork
Biblical reasoning to not eat pork
Ascaris
Effect the intestine and can cause a
blockage.
Most symptoms are diahhrea, nausea, etc.
Filarial worms
Contracted by horse fly or deer fly also
causes elephantitis
hookworms
Humans can contract hookworms by
walking barefoot on contaminated soil.
Also by eating improperly washed
vegetables
Pin worm
Scratching infected area and touching
someone else and passing on eggs. Then
they are ingested and the process occurs
again.
Phylum Annelida = Segmented Worms
Special Structures:
anus
Satae – external bristles
for movement
satae
metameres
gizzard crop
mouth
brain
nephridia
ganglia
Phylum Annelida = Segmented Worms
Body symmetry: Bilateral
Body cavity: Coelomates
Respiratory: gills (aquatic) or through skin
Circulatory: closed circulatory system
Phylum Annelida = Segmented Worms
Excretory: Nephridia
Response: Brain with dorsal & ventral nerve cords,
some sense organs
Feeding: aquatic – filter feeders; detritivores; parasitic
Movements: satae, muscles, hydrostatic skeleton
Reproduction: sexual & some hermaphroditic
P2 = slate
Write down 2 questions about phylum
platyhelminthes that might be asked on a
test. (leave space for an answer)
Trade slates with a partner and answer the
questions they wrote.
Phylum Annelida = Segmented Worms
Examples: earthworm & leech
leeches
Attach to their host until they are full and
then fall off to digest.
In some cases a leech carries the
diseases from prior hosts and infects the
new host (HIV, Hepatitis).
Assignment
Choose an article about a parasitic worm
from one of the phyla discussed today.
Create an informational brochure about
the parasite you chose.
Your brochure must include illustrations
(picture of parasite, life cycle, etc) You
may use you book for help, Chp. 27
Ticket out
On a piece of paper, create a chart
comparing 5 characteristics between the
three phyla discussed today.