Platyhelminthes Flashcards
Size of Platyhelminthes
Vary in size from a millimeter to many meters in length like tapeworms
Shape of Platyhelminthes
Normally slender, leaf-like form but can also be long and ribbon-like
Symmetry of Platyhelminthes
Bilateral
Forms a protective barrier that guards the parasite against the immune system of the host
Tegument
In general, platyhelminth digestive systems include a ____, a ___, and an ____
mouth; pharynx; intestine
True or False: Platyhelminthes are herbivores
False; carnivorous
True or False: Cestodes possess a digestive tract
False
____ systems control water balance
Osmoregulatory
Flagellated flame cells
Protonephridia
Sense organs of Platyhelminthes
Ocelli or eyespots
Reproduction of Turbellaria
Asexual (fission) and Sexual reproduction
Reproduction of Trematodes
asexual reproduction happens in their intermediate host (snail)
True or false: Almost all flatworms are monoecious
True
Habitat/s of Class Turbellaria
Marine, freshwater, and terrestrial habitats
Differentiate Endoparasites from Ectoparasites
Endo = inside the host; Ecto = outside
Least well-known subclass of Trematoda
Subclass Aspidogastrea
More well-known subclass of Trematoda
Subclass Digenea
First intermediate host of Trematoda
Mollusk
Schistosoma that lives primarily in veins draining the large intestine
S. mansoni
Schistosoma that occurs mostly in veins of the small intestine
S. japonicum
Schistosoma that lives in veins of the urinary bladder
S. haematobium
Shelled embryo
Egg
free-swimming larva; hatches out from its shell; discards its ciliated epithelium; penetrates IH
Miracidium
Sac-like form; several embryos develop asexually to become rediae
Sporocyst
develop within the redia; emerges from the snail; possess tail for swimming; considered as juveniles
Cercariae
Infective stage (definitive host); encysted stage
Metacercariae
Embryo; Pharynx and gut
Rediae
usually bears the encysted metacercariae
Second IH
Are Monogenea endoparasites or ectoparasites?
Ectoparasites
External parasites of many fish, especially on gills, but a few are found in bladders of frogs and turtles.
Class Monogenea
A problematic pathogen in crowded fish farming
Class Monogenea
True or False: Class Cestoda are Endoparasites
True
True or False: Class Cestoda lack digestive system but have well-developed muscles.
True
True or False: Class Cestoda lack sensory organs
True
True or False: Proglottid formation is a true segmentation
False
Nearly all cestodes require how many host/s?
Two
In Cestodes, the adult is parasitic in the ____ of the vertebrates
digestive tract
Taenia saginata common name
Beef tapeworm
Taenia solium common name
Pork Tapeworm
Diphyllobothrium latum common name
Fish tapeworm
Dipylidium caninum common name
Dog tapeworm
The anterior end of a tapeworm that bears suckers and hooks for attachment
Scolex
Each segment in the strobila of a tapeworm
Proglottid
Consists of proglottid, segmented part of the body of a tapeworm
Strobila
Replication of sex organs
Pseudometamerism
