1. Nematoda and Rotifera
Bilaterally symmetrical bodies with fluid filled space that holds storage areas and sperm and supports the body

2. Phylum Nematoda Made of roundworms
Worms with long slender body that taper at both ends
Psuedocoelomates-have psuedocoelom, hollow-filled cavity lined by mesoderm on outside endoderm in inside
Range from 1 mm to 250 cm (4 ft)

3. Digestive track with 2 openings
Food enters the anterior mouth and waste leaves through posterior anus created a digestive tract.
One direction
Different parts of the tract able to do different things i.e., absorb different nutrients
Most have different sexes and separated by a non celled cuticle

4. 80,000 species known, estimated 500,000 more
Majority free living on land, in salt water, in fresh water
Caenorhabditis elegans – C. elegans used to study development by biologists
150 species parasites
Humans host 50 species

6. ascaris Genus of nematoda that are parasites
Live in intestines of pig, horses, humans.
Feed on food as it passes through intestines
Can multiply and block intestines if not treated

7. Female up to 30 cm, males much smaller
Males hook in posterior to hold female during reproduction
One female 200,000 eggs/day
Eggs can live outside host for long time.
Then enter another host where become larva
Larva can travel through body including lungs then mature worm goes back to intestines

9. Hookworms Intestinal parasites
Mouth has cutting plates that secure onto host’ intestinal wall
Feed on blood if many present creates anemia in host
In children slow mental and physical development

10. Release eggs inside host’s feces
Eggs produce larvae in damp dark soil
Enter new host by boring into feet
Then move to throat and lungs
Swallowing takes them to the intestines where they mature
Infect 400 million people world wide
Most in tropical and subtropical region

12. Guinea worm
video

13. Trichinella Infect humans, pigs, other mammals
Live in walls of intestine of host
Larvae travel to muscles, form cysts
People get infected when eat undercooked meat
The cyst release larvae which attach to intestine- become adults
Infections=tricinosis
Muscle pain, stiffness, death= results

15. Other parasitic round worms
Pinworm-most common in human 16% of adults
No serious disease
5-10mm in length-resemble white threads
Live+mate lower intestines
Eggs laid on skin around anus

16. Filarial worms Disease causing round worm in tropical countries
Most dangerous live in lymphatic system
Excess fluid system from cells
up to 100 mm long, 4 inches
Mosquitoes suck eggs out of blood
Passed to another host when feeding
Larvae then go to lymphatic system to start again.
Ex. Elephantiasis, heartworm disease

18. Phylum Rotifera Rotifers=members of phylum
Most transparent, free-living in fresh water
Length of micrometers males smaller gender
Many can survive w/out water for long time
Dry up till water can hydrate again look like sand
psuedocolemates

20. Crown of cilia surounds mouth
Sweeps food into dig, tract
Food goes next into mastex, breaks food up
Which is then digested in stomach
Intestines absorb nutrients
Waste pass through cloaca where all waste is collected
Leave through anus
Eggs leave same way from ovaries

21. +
Using your notes come up with 3 similarities btw rotifers and roundworms