Parasite introduction (3) Flashcards
what are the two types of helminths?
nematodes (roundworms)
platyhelminths (cestodes and flukes)
what are nematodes also called?
roundworms
what are platyhelminths also called?
flatworms - cestodes and flukes
what are protozoa?
single celled organisms
what are the two types of arthropods?
arachnids
insects
are all nematodes parasitic?
no - both free living and parasitic species
what is the very outer surface of a nematode called?
cuticle
what are the three layers of a nematodes body wall?
muscle cells (inside)
hypodermic
cuticle (outer)
what is the function of a nematodes cuticle?
maintain the structure of the worm
what is parts of the nematodes digestive tract?
mouth
buccal cavity
oesophagus
intestine
anus
what are some possible external decorations that can be seen on the cuticle of nematodes?
cervical papillae
spicules
bursa (males)
vulva flap
how to the size of male and female nematodes compare?
females usually larger (need to hold eggs)
what word would be used to describe the lifecycle of trematodes?
indirect
what are trematodes also called?
fluke
what are cestodes also called?
tapeworm
how does the sexual reproduction of nematodes and trematodes vary?
trematodes are hermaphrodites where as nematodes exists as two different sexes
what is the outer layer of a trematode called?
tegument
are tapeworms parasitic?
yes they are always parasitic
what is the name of the stage of the tapeworm in the intermediate host?
metacestode
what is the name of the outer layer of tapeworm?
tegument
what kind of lifecycle do tapeworms have?
indirect
what are the important protozoa of veterinary importance?
Babesia
Toxoplasma
Giardia
Trypanosomiasis
Leishmaniasis
what structures make up a protozoa?
nucleus, cytoplasm, endoplasmic reticulum, Golgi apparatus, mitochondria, lysosomes
how do protozoa reproduce?
sexually and asexually (binary fission, schizogony)
how can protozoa divide asexually?
binary fission
schizogony
what is the feeding stage of protozoa known as?
trophozoite
