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SA External Parasites
JJC Vet Tech 140
69
Veterinary Medicine
Undergraduate 1
02/17/2014

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Cards

Term
Which of the following are insects?
-dipterans
-mites
-lice
-fleas
-ticks
Definition
-dipterans
-lice
-fleas
Term
Which of the following are arachnids?
-dipterans
-mites
-lice
-fleas
-ticks
Definition
-mites
-ticks
Term
What are the sub-orders of lice?
Definition
Mallophaga (chewing/biting)
Anoplura (sucking)
Term
The order Diptera contains what bugs?
Definition
-moquitoes -flies -gnats -keds
Term
What is the order of fleas?
Definition
Siphonaptera
Term
The class Arachnida contains what bugs?
Definition
-ticks
-mites
-spiders
---not insects
Term
Insects and arachnids are in the phylum ___, which means "___."
Definition
Arthropoda - "Jointed-leg"
Term
Distinguishing features of an insect?
Definition
-paired antennae
-3 body parts (head, thorax, abdomen)
-6 legs on thorax
-eyes
Term
Distinguishing features of an arachnid?
Definition
-2 body parts (head, cephalothorax)
-no antennae
-no eyes (in the parasites we care about)
-8 legs
Term
What type of agent is used to kill arachnids?
Definition
acaricide
Term
What type of agent is used to kill insects?
Definition
insecticide
Term
What type of agent is uesd to kill roundworms?
Definition
ascaricide
Term
Ascariasis vs acariasis?
Definition
ascariasis = infection with roundworms (ascarids)

acariasis = infestation with arachnids
Term
Ticks feed on ___.
Definition
blood
Term
How many hosts do ticks have?
Definition
varies - may have 1, 2, 3
Term
The "baby" form of an arachnid?
Definition
nymph- looks like mini adult, but some only have 6 legs
Term
Basic life cycle of a tick?
Definition
egg -> nymph -> (molt 1-3x) -> adult
Term
What happens every time a tick nymph molts?
Definition
it switches hosts
Term
Soft ticks are in the family ___.
Definition
Argasidae
Term
Hard ticks are in the family ___.
Definition
Ixodes
Term
Ticks are most plentiful where?
Definition
-brush or wooded areas
Term
Describe how Argasidae look.
Definition
-wrinkly, leathery "shell"
-may be mammalated
-very flat body
Term
Describe how Ixodes look.
Definition
-hard shell
-scutum (ornate or inornate)
-festoons
Term
How to ID a specific Ixodes?
Definition
-is scutum inornate or ornate?
-specific scutum patterns if ornate
Term
Scientific name of the common brown dog tick?
Definition
Rhipicephalus sanguineus
Term
Common names of 3 ticks we talked about in class?
Definition
-common brown dog tick
-Lone Star tick
-American dog tick / RMSF tick
Term
Which tick is most closely associated with Lymes?
Definition
Lone Star tick (Amblyoma americanum)
Term
Which tick is most closely associated with Babesia canis?
Definition
common brown dog tick (Rhipicephalus sanguineus)
Term
Females of what species of tick can lay up to 4000 eggs?
Definition
common brown dog tick (Rhipicephalus sanguineus)
Term
What disease/s is/are associated with the common brown dog tick?
Definition
-tick paralysis
-Babesia canis
-Ehrlichia canis
-Hepatozoon canis
-RMSF
Term
RMSF
Definition
Rocky Mountain Spotted Fever
Term
What disease/s is/are associated with the Lone Star tick?
Definition
-RMSF
-Lymes
Term
What disease/s is/are associated with the American dog tick?
Definition
-RMSF
Term
What ticks have ornate scutums? Inornate scutums?
Definition
Ornate: -Lone Star tick (Amblyoma americanum) -American dog tick (Dermacentor variabilis) Inornate: -common brown dog tick (Rhipicephalus sanguineus)
Term
What tick is very commonly seen on dogs and looks like big, greyish blobs?
Definition
common brown dog tick (Rhipicephalus sanguineus)
Term
Females of what species of tick can lay 1000-8000 eggs?
Definition
Lone Star tick
Term
Basic life cycle of the flea?
Definition
egg -> larva -> pupa -> adult
Term
How long does it take for a flea egg to reach adulthood?
Definition
18 days to 20 months
Term
Genus and species of the flea?
Definition
Ctenocephalides felis
Term
FAD
Definition
Feline Allergic Dermatitis
Term
What exactly causes FAD?
Definition
flea saliva causes an allergic rxn - not dependent on # bites
Term
"Hot spots" are most closely associated with what ectoparasite?
Definition
Ctenocephalides felis
Term
What are "environmental hot spots"?
Definition
areas in the home/environment where the animals spend the most time, and thus where the highest concentration of flea larvae can be found (bc eggs fall there the most)
Term
Flea larvae feed on...
Definition
anything organic
Term
Pre-emergent adult fleas are stimulated to emerge by:
Definition
^temp
^CO2
^vibrations
^humidity
Term
What stage of flea sucks blood?
Definition
adults - generally just females
Term
Fleas can transmit...
Definition
Dipetalonema reconditum
Dipylidium caninum
Term
Term for an infestation of lice?
Definition
pediculosis
Term
Differences between Mallophaga and Anoplura?
Definition
Mallophaga:
chew/bite
head > thorax
move rapidly
small, yellow
pruritic
feed on epithelial debris

Anoplura:
suck blood
tiny head
move slowly
large, grey/red
non-pruritic
feed on blood
Term
What type of ectoparasite spends its entire life cycle on the host?
Definition
lice
Term
Basic life cycle of lice?
Definition
-eggs/nits laid on hair shaft
-3 nymph stages
-adults
Term
How are lice transmitted?
Definition
direct contact
Term
Genera and species of the 3 lice we talked about in class?
Definition
Trichodectes canis
Felicola subrostratus
Linognathus setosus
Term
What specific louse is IH of Dipylidium caninum?
Definition
Trichodectes canis
Term
What species of Mallophagian lice did we cover?
Definition
Trichodectes canis
Felicola subrostratus
Term
What species of Anopluran lice did we cover?
Definition
Linognathus setosus
Term
Which type of lice are more likely to cause pruritis?
Definition
biting/chewing, not sucking
Term
Special feature of mite appendages?
Definition
pedicel - small stalk with sucker on end; may be jointed
Term
Basic life cycle of mites?
Definition
egg -> nymph -> 3 molts -> adult
Term
Which mite is small and round?
Definition
Sarcoptes
Term
Which mite is larger and elongated?
Definition
Demodex
Term
Why is Sarcoptes hard to diagnose?
Definition
-smaller
-burrow under the skin which causes severe pruritis, but there may only be a few on the entire animal
Term
Skin scraping tips:
Definition
-multiple sites
-edges of alopecia
Term
Where in the skin does Sarcoptes live?
Definition
burrows tunnels in the skin
Term
Where in the skin does Demodex live?
Definition
burrows down to roots of hair follicles and/or into sebaceous gland
Term
Genus and species of ear mite?
Definition
Otodectes cynotis
Term
Cuterebra is also known as...
Definition
rodent bot fly
Term
What type of bug is Cuterebra?
Definition
Dipteran instar
Term
Life cycle of Cuterebra?
Definition
-fly lays egg on skin/face
-hatches into larvae and burrows SQ
-emerges in 1-2mo
-pupates
-adult fly
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