Equine mites and lice Flashcards Preview

Parasitology - Ectoparasites > Equine mites and lice > Flashcards

Flashcards in Equine mites and lice Deck (29)
Loading flashcards...
1

What class of ectoparasites are mites? What order?

Arachnids
Acarina

2

What are the two types of mites? Which cause mange?

Non-burrowing
Burrowing
Both cause mange and dermatitis

3

Describe the morphology of all mites

Cephalothorax
8 legs in adult/nymph
No distinct abdomen

4

What mites are found in cattle, sheep and goats?

Chorioptes bovis
Psorpotes ovis

5

What mite is found in dogs?

Sarcoptes scabeii

6

What is the only mite (we need to know) in horses? Is it burrowing or non-burrowing

Chorioptes bovis
Non-burrowing

7

What do Chorioptes bovis mites feed on? How is their mouth adapted for this?

Scales/skin
Round mouthpart

8

In what season does Chorioptes bovis affect horses? What part of the body do they affect?

Winter
Lower limbs (particularly feathered animals)

9

Describe the morphology of Chorioptes bovis

Round head and mouthpart
Thumb print on body
Very short pedicles at front with cup shaped suckers

10

How log is the life cycle of chorioptes bovis?

3 weeks

11

What signs do horses show in response to Chorioptes bovis infestation?

Stamping legs
Papules
Crusty lesions
Hair loss

12

What is used to treat Chorioptes bovis?

No licensed product - fipronil

13

Apart from fipronil, how can Chorioptes bovis infestation be reduced?

Clip feathers
Clean rugs/clippers
Use antiseptic cream and hibiscrub on scabs

14

What class and order are lice?

Arachnid Phthiraptera

15

Lice are obligatory parasites. What does this mean?

Die within days without host

16

What are the 2 suborders of lice?

Mallophaga - biting/chewing, feed on skin/scales
Anoplura - sucking, feed on blood

17

Do lice have wings? Describe their morphology

Flat wingless insects
Stout legs
Claws to cling onto fur/feathers/hair

18

What is the lifespan of of adult lice? How many eggs can they lay during this time?

1 month
Hundreds

19

How long does it take for a lice nymph to hatch from the egg? What is a louse egg called?

1-2 weeks
Nit

20

How long is the lifecycle of a louse?

2-3 wks

21

What is the word for lice infestation? What does it cause?

Pediculosis
Irritation, pruritis, dermatitis, lack of weight gain

22

What can be used to treat lice in horses?

Synthetic pyrethroids (permethrin, cypermethrin - also used for equine flies)

23

What are the advantages of SP for treatment of flies and lice? What should you be aware of?

Slowly metabolised and eliminated
Low mammalian toxicity
Dangerous to fish/crustaceans - careful disposal
Toxic to cats!

24

Give an example of a Mallophaga (chewing) and an Anoplura (sucking) louse found on horses

Mallophaga - Bovicola equi
Anoplura - Haematopinus asini

25

Describe the morphology of Haematopinus asini

Sucking mouthpart (long)
Large mite (5mm)
Yellow/brown with dark margins on abdomen - dragon fruit

26

Describe the morphology of Bovicola equi

Brown/grey
Striped abdomen
Flat head - chewing mouthpart

27

Where are equine lice most commonly found?

Base of tail and mane (hair

28

When are equine lice usually seen?

Winter/Spring - thick coats or wearing a rug
Populations diminish as shed Winter coat and more light

29

What IPM can be done for equine lice management?

Clean rugs and blankets