Flatworms Flashcards
Flatworm phylum is
Platyhelminthes
What body does a flatworm have??
A flat body
Triploblastic
3 layers of tissue
Ectoderm
Epidermis
Mesoderm
Parenchyma
Endoderm
Gastrodermis
What kind of symmetry does a flatworm have?
Bilateral symmetry
Digestive
Incomplete, one body opening mouth, pharynx, intestine
Excretory
Flame cells- rid of waste and water
What does the flame cells do?
Get rid of waste and excess water
Nervous system
Exhibit cephalization
Cephalization
Important organs grow near one’s head aka eyes
Ladder type nervous system
Two lateral nerves connected by a series of transverse nerves
Ocelli
Eyespots, detect light
Statocysts
Detect position, balance
Rheoreceptors
Detect water current
How are flatworms sexually reproductive?
Monoecious (female and male gamete’s)
How do flatworms reproduce asexually?
Fission, regeneration
What is one example of class turbellaria?
Planaria
What is the only free living flatworms?
Planaria
Auricles are where?
On either side of the head
Near Statocysts, rheoreceptors, chemoreceptors
Chemoreceptors
Detect chemicals such as food
Rhabdites
Cells that secrete mucus for locomotion
What do flatworms eat?
They are mainly carnivorous
How can Planaria reproduce?
Monoecious, fission, regeneration
Class trematoda
Fluke
What are trematodes?
Parasites
Penetration glands
Some way to get into the body
Organs of adhesion
Suckers, hooks, a way to hang on
Cyst
Producing glands
Producing glands
For protection either inside the host body or until it can invade a host
Flukes and trematodes
Greatly increased reproductive capabilities ( a few actually survive)
Intermediate host
Usually invertebrate animal, infected by larval form of parasite
Definitive/ final host
Usually vertebrae animal, where parasite matures and reproduces
What are two examples of class trematoda?
Liver fluke and blood fluke
Liver fluke means of infection
Eating raw fish/ infected sushi
Liver fluke intermediate host
Snail-(cervariae)[tadpole shaped larval]
Fish
Liver fluke definitive host
Human, cat, dog, bird
Liver fluke symptoms
Abdominal discomfort
Fever
Nausea
Vomiting
Liver fluke how to avoid
Cook fish thoroughly
Blood fluke means of infection
Swimming where ducks gather
Blood fluke intermediate host
Snail
Cercariae
Blood fluke definitive host
Human or duck
Blood fluke symptoms
Itchy
Red skin
Dermatitis
Blood fluke how to avoid
Do not feed the ducks
What class is Planaria?
Turbellaria
What class is gross parasites liver and blood fluke?
Trematoda
What class is gross and parasite tapeworms?
Cestoda
Are cestodos/ tapeworms parasites?
Yes and they have a long body
Proglottids
Body segments, each monoecious
Scolex
Organ of attachment, head, has suckers and hooks
What type of digestive track does a tapeworm have?
It has no digestive system of its own because it is a parasite
Step one of beef tapeworm life cycle
Shelled larvae shed feces
Step two of beef tapeworm life cycle
Cow eats grass contaminated with eggs
Step three of beef tapeworm life cycle
Worms form cysts in cow’s muscle
Step four of beef tapeworm life cycle
Human eats raw/ undercooked beef
Step five of beef tapeworm life cycle
Worm becomes active, matures, and attaches in intestine where it feeds off hosts digested food
Phylum nematodes
Roundworms
What body shape and symmetry do roundworms have?
Round/cylindrical bodies
Bilateral symmetry
Roundworm digestive system
Alimentary canal
Alimentary canal
Two body openings
Mouth at the anterior end
Food passes through a series of organs
Waste releases from anus at the posterior end
Roundworms are covered with what?
Cuticle
Cuticle
No living covering made of tough collagen protein
What type of skeleton does a roundworm have?
Hydrostatic skeleton
What is the nerves in roundworms?
Ganglia and two nerve cords
Dorsal and ventral
How do roundworms reproduce?
They are dioecious ( separate sexes)
Roundworms are?
Free living
And some are parasitic
Ascaris infection of roundworms
1-juveniles are ingested dirty hands or unwashed vegetation
2- hatch in intestine travel through blood to lungs
3- break out into alveoli(air sacs) of lungs
4-move up through trachea to pharynx, swallowed
5- travel to intestine, mature feed and reproduce there too
What are the hosts of ascaris?
Vertebrares
Pigs
Dogs
Humans
What are the symptoms of ascaris?
Pneumonia and intentional blockage
How does one avoid ascaris?
Wash hands and vegetation
How do you get hookworm?
1- shelled embryos in fecal infested soil
2- young hatch and feed on bacteria in soil
3- burrow into skin of bare feet usually through small cut
4- travel through blood to lungs up trachea and swallow
5- mature feed reproduce in intestine
What hosts hookworm?
Humans
What are the symptoms of hookworm
Anemia
Can cause mental and physical retardation in young children
How does one prevent hookworm?
Wear shoes
How do you get trichina?
1- eat meat containing the live juveniles
2- mature and reproduce in intestinal wall, young travel through blood
3- young found throughout body- burrow in skeletal muscles
Hosts of trichina?
Pigs=intermediate
Humans= definitive
What are the symptoms of trichina?
Trichinosis
Vomiting
Diharreah
How to prevent trichina?
Cool pork well
How to get pinworm?
1- eggs are swallowed so small they are in the air
2- adults live in large intestine
3- females migrate to anus at night - lays eggs causes itchy anus
4- scratch itch- eggs in hands- sheets are infected
Host of pinworm?
Humans
Symptoms of pinworm
Itchy anus
Prevention of pinworms
Do not scratch and wash sheets
How to get filarías worms?
1- juveniles are vectors transmitted by flies or mosquitoes
2- obstruct the lymphatic system, causes backup or pooling of lymph fluid which results in swelling and dead tissues
Hosts of filarial worms
Humans
Dogs
Symptoms of filarial worms
Elephantiasis for humans
Heart worm for dogs
How to prevent filarial worms
Avoid contact if possible and take medication
Phylum annelida
Segmented worms
Segmented worms are- three basic characteristics?
Segmented
Bilateral symmetry
Triploblastic
Coelomates
Coelomes divided by partitions by septa
What type of digestive system do segmented worms have?
Complex organ systems
Digestive
Circulatory (closed)
Setae
Aid in locomotion
Hemoglobin
Red color
Nephridia
Excretory organs
In segmented worms where does gas exchange through?
The epidermis
Segmented worms are all?
Hermaphroditic
Segmented worms sexually produce by?
Cross fertilization
How do segmented worms reproduce asexually?
Regeneration
There are over how many kinds of segmented worms?
15,000
Class oligochaeta
Earthworms
Earthworms
Extract nutrients from soil
Beneficial to farming, enrich and aerate soil
Class polychaeta
Claw worm/ lugworm
Clawworm/ lugworm
Similar to earthworm(oligochaeta)
Mostly marine
Parapodia
Aid in gas exchange and locomotion
Parapodia
Paddle ridge, like extensions on segments
Aid in gas exchange and locomotion
Class hirudinea
Leeches
Leeches
Mostly freshwater/ moist terrestrial environment
Feed on small invertebrates
Can be parasitic
Medical value, treating bruising, pharmaceuticals