Mites

Question 1

Outline the basic steps of the 2 mite lifecycles.

Answer 1

Egg > larva > protonymph > deutonymph > tritonymph > adult

Egg > larva > protonymph > tritonymph > adult

Question 2

What is the appearance of the scabies mite?

Answer 2

Round bodies
Short legs
Long straight pedicles

Question 3

How can the scabies mite be identified?

Answer 3

Adult females in stratum corneum

Question 4

What is caused by the scabies mite?

Answer 4

Sarcoptic mange. Zoonotic. Common in dogs and pigs at pineal margins and external ear canals.

Question 5

What is the scaroptiform mites scientific name?

Answer 5

Trixacarus caviae

Question 6

How can the scaroptiform mite be differentiated from the scabies mite?

Answer 6

Different anus position then scabies mite

Question 7

Which animal is the scaroptiform mite common in?

Answer 7

Guinea pigs

Question 8

What is the appearance of knemidocoptes gallinae?

Answer 8

Round with short legs

Question 9

Which animal is knemidocoptes gallinae common in?

Answer 9

Birds

Question 10

What does knemidocoptes gallinae cause?

Answer 10

Feather loss and scale

Question 11

What does the knemidocoptes mutans mite cause and in what animal?

Answer 11

Scaly leg in backyard chickens

Question 12

What are the clinical signs of scaly leg due to the knemidocoptes mutans mite?

Answer 12

Thickening of the skin
Loss of feathers
Scaling

Question 13

What is the appearance of psoroptes ovis?

Answer 13

• Long legs
• Funnel shaped suckers
• 3 jointed pedicel
• Pointed mouthparts
• Rounded abdominal tubercles in male

Question 14

What does psoroptes ovis cause?

Answer 14

Sheep scab, severe pruritis

Question 15

What animals does psoroptes ovis affect?

Answer 15

Sheep and can affect cattle, but mites do not pass between sheep and cattle.

Question 16

Why is psoroptes ovis hard to eradicate?

Answer 16

Can survive off host for 2 weeks

Question 17

How can sheep scab be controlled?

Answer 17

Dips
Inject macrocyclic lactones
Quarantine new

Question 18

What is the appearance of chorioptes bovis?

Answer 18

• Long legs
• Short unjointed pedicles
• Cup shaped pedicles
• Rounded mouthparts
• Truncate abdominal tubercles in male

Question 19

Which animals does chorioptes bovis affect?

Answer 19

Commonly cattle
Horses

Question 20

Why is chorioptes bovis difficult to eradicate?

Answer 20

Survives 3 weeks off host

Question 21

How is chorioptes bovis different to psoroptes ovis?

Answer 21

Less pathogenic

Question 22

Where are chorioptes located on the animal?

Answer 22

Lower legs
Base of tail peritoneum
Udder
Scrotum

Question 23

What is the appearance of otodectes cynotis?

Answer 23

Long legs
Relatively large
No joined pretarsi

Question 24

How can otodectes cynotis be distinguished from psoroptes ovis?

Answer 24

Smaller than psoroptes ovis

Question 25

Which animals are affected and at which site by otodectes cynotis?

Answer 25

Cats and dogs Around ear

Question 26

Which mite causes demodicosis?

Answer 26

Demodex canis (also called demodex injar in dogs)

Question 27

What is the appearance of demodex canis?

Answer 27

Small Elongated Cigar shaped

Question 28

How can demodex canis pass to young?

Answer 28

Suckling

Question 29

How is demodectic mange diagnosed?

Answer 29

Skin scrapes Hair plucks Skin biopsies

Question 30

What is the appearance of cheyletielldae?

Answer 30

Large Curved palpal claws Genu on first legs

Question 31

Which animals are affected by cheyletielldae?

Answer 31

Rabbits Cats Dogs

Question 32

What does cheyletielldae cause?

Answer 32

Mild but highly contagious zoonosis

Question 33

What is the scientific name of berry bugs?

Answer 33

Trombiculidae/Neotrombicula autumnalis

Question 34

What is the appearance of berry bugs?

Answer 34

6 legged Large Orange/yellow larvae

Question 35

What do berry bugs cause?

Answer 35

Pruritic skin disease

Question 36

Name the 2 types of mesostigmatid.

Answer 36

Northern fowl/ornithonyssus sylvarium Red mite/dermanyssus gallinae

Question 37

Which animal does mesostigmatid affect?

Answer 37

Birds

Question 38

Where is the lifecycle of northern fowl mite located?

Answer 38

Entire lifecycle on host, eggs at the base of feather

Question 39

How long is the northern fowl mite lifecycle?

Answer 39

5-12 days

Question 40

Where is the lifecycle of red mite located?

Answer 40

- Most lifecycle of host - Feed at night - 34 weeks off host survival

Question 41

How long is the lifecycle of red mite?

Answer 41

7 day lifecycle 24 weeks off host survival

Question 42

What are the clinical signs caused by mesostigmatid mites?

Answer 42

Irritant Anaemia in severe cases Death Decreased egg production

Question 43

What diseases can mesostigmatid mites transmit?

Answer 43

Salmonella Mycoplasma Avipox virus pathogens

Question 44

How are mesostigmatid mites and their transmitted diseases managed?

Answer 44

Avoid wild birds Deep clean Isoxazolines Pyrethroids Avermectins IGRs sprays