Platyhelminthes Flashcards
What does Platyhelminthes mean?
Greek :
Platy = flat
Helmins = worm
How many germ layers does Platyhelminthes have?
Triploblastic = 3 germ layers
What kind of coelom does Platyhelminthes have?
Acoelomate = no body cavity
What symmetry is Platyhelminthes?
Bilateral
What is special about the bodies of Platyhelminthes?
It is dorsoventrally flattened
What are the 2 things to describe the epidermis layer of Platyhelminthes?
1- cellular
2- syncytial (single cell mass with multiple nuclei)
What are the 4 classes of Platyhelminthes?
1- Turbellaria
2- Cestoda
3- Monogena
4- Trematoda
Explain the nervous system of the Class Turbellaria of the phylum Platyhelminthes
Have nerve net = cerebral ganglion and 1-3 pairs of nerve chords
What is the sexual reproduction of the Class Turbellaria of the phylum Platyhelminthes
Hermaphroditic
What can be said about the epidermis layer of the Class Turbellaria of the phylum Platyhelminthes (3 things it contains)
It is ciliated = has secreting cells and rehabdites and rhabdoids that release thick mucus to coat body
What is the order of the Class Turbellaria of the phylum Platyhelminthes?
Tricladida
What does the gut of the order Tricladida of the Class Turbellaria of the phylum Platyhelminthes have?
3 distinct branches
What are the freshwater members of the order Tricladida of the Class Turbellaria of the phylum Platyhelminthes known as?
Planaria
What are the 2 families of the order Tricladida of the Class Turbellaria?
1- Planaridae
2- Dugesiidae
What is an example of the family Planaridae of the Order Tricladida of the Class Turbellaria?
Planaria
What is an example of the family Dugesiidae of the Order Tricladida of the Class Turbellaria? Used for?
Dugesia
Used for regeneration studies
What are the 5 things that the Class Turbellaria of Platyhelminthes respond to?
Light, contact, chemicals, food and water currents
What is the subclass of the Class Cestoda of the phylum Platyhelminthes?
Eucestoda
What is the subclass Eucestoda of the Class Cestoda?
True tapeworm
What are the orders and families in the subclass Eucestoda of the Class Cestoda based on?
Based on scolex morphology
What are the 2 families to know of the subclass Eucestoda of the Class Cestoda?
1- Taeniidae
2- Hymenolepididae
What are the 2 examples of the family Taeniidae of the subclass Eucestoda of the Class Cestoda? What are they used for?
Taenia, Echinococcus
Medical importance
What are the family Hymenolepididae of the subclass Eucestoda of the Class Cestoda?
Parasites of birds and mammals
What is an example of the family Hymenolepididae of the subclass Eucestoda of the Class Cestoda? What is it used for?
Hymenolepsis diminuta - model species for medical research
Where can Hymenolepsis diminuta be found?
Found in rodents - rat tapeworm
What is the only thing to know about the class Monogena?
That they are simultaneous hermaphrodites
What are the class Trematoda known as?
Flukes
What is one of the subclasses of the class Trematoda?
Digenea
What are 3 orders of the subclass Digenea of the class Trematoda?
1- Streigedida
2- Echinostomida
3- Opisthorchiida
What is the family of the order Streigedida of the subclass Digenea of the class Trematoda?
Schistosomatidae
What is an example of the family Schistosomatidae of the order Streigedida?
Schistosoma = blood flukes
Where are blood flukes (Schistosoma) of the family Schistosomatidae found?
2 hosts - snails or vertebrates = found in the blood vessels of mammals and birds
What is an example of the the Order Echinostomida of the subclass Digenea of the class Trematoda?
Fasciola
Where are the Order Echinostomida of the subclass Digenea of the class Trematoda found?
Parasites of the cloaca (type of body cavity) and intestines of birds/mammals
What is special about the life cycle of the the Order Opisthorchiida of the subclass Digenea of the class Trematoda?
Requires 3 hosts
What is the family of the Order Opisthorchiida of the subclass Digenea of the class Trematoda?
Opisthorchiidae
What is an example of the family Opisthorchiidae of the Order Opisthorchiida of the subclass Digenea of the class Trematoda?
Clorchis sinensis
What are the family Opisthorchiidae of the Order Opisthorchiida known as? Where are the found?
Chinese liver flukes - infected 30 million people
Live on file ducts of human hosts
If the Class Trematoda is parasitic, where are they found?
Endoparasites of vertebrates
What is the class Trematoda structurally similar too? How is it different?
Similar to the Class Turbellaria but has no external cilia - has cuticle instead
