02 + 03. nematodes Flashcards
—- are round worms
nematodes
nematodes have a coating of —
cuticle
acellular, protective coating
nematodes= round worm
alae are —
cuticular evaginations
wings
on nematodes (round worms)
bursate nematodes have —
male tail has a copulatory bursa to clasp onto the female during mating
round worms- nematodes
non-bursate nematodes have —
pre-cloacal sucker used to hold female during sex
nematodes= roundworm
nematodes go through a — from L1-L2
moult
get bigger
exsheathment
direct lifecycle of nematode
parasite to host, no intermediate
can either ingest egg(hatched or unhatched) or free-living larvae
indirect nematode life cycle
Intermediate host required for development of pre-
parasitic larvae
Definitive host ingests intermediate host(paratenic)
Intermediate host serves as a vector
passive transmission
Definitive host
Sexual reproduction in the definitive host
intermediate host
Provide physiological requirements for development of larvae
Provide advantages for transmission of parasitic nematodes
Paratenic
No development of larval stages
transport
Predator/prey relationship with definitive host
— in ascaris suum life cycle acts as a paratenic host
earthworm
another name for arrested development
hypobiosis
— is the inhibition of larval development
arrested development
hypobiosis
why does parasite go into hypobiosis
survival mechanism against adverse environment (winter)
True or false
drugs work better when a parasite is in hypobiosis
false
parasite is not metabolically active, most drugs will not work
Larvae arrest at the L4 in the fall; emerge the following spring in —
spring rise
periparturient rise
strongylida are — parasites
GI
what stage of strongylida are found in the environment?
L1-L3
nematodes (roundworm)
strongylida are — copulators
bursa
— are hookworms
Superfamily Ancylostomatoidea
bent head, oral cutting plate or teeth
— have cutting plates or teeth
Ancylostomatoidea: hookworms
strongylida have a large — and are — feeders
buccal
plug or blood feeders