Mites Flashcards
Outline the basic steps of the 2 mite lifecycles.
Egg > larva > protonymph > deutonymph > tritonymph > adult
Egg > larva > protonymph > tritonymph > adult
What is the appearance of the scabies mite?
Round bodies
Short legs
Long straight pedicles
How can the scabies mite be identified?
Adult females in stratum corneum
What is caused by the scabies mite?
Sarcoptic mange. Zoonotic. Common in dogs and pigs at pineal margins and external ear canals.
What is the scaroptiform mites scientific name?
Trixacarus caviae
How can the scaroptiform mite be differentiated from the scabies mite?
Different anus position then scabies mite
Which animal is the scaroptiform mite common in?
Guinea pigs
What is the appearance of knemidocoptes gallinae?
Round with short legs
Which animal is knemidocoptes gallinae common in?
Birds
What does knemidocoptes gallinae cause?
Feather loss and scale
What does the knemidocoptes mutans mite cause and in what animal?
Scaly leg in backyard chickens
What are the clinical signs of scaly leg due to the knemidocoptes mutans mite?
Thickening of the skin
Loss of feathers
Scaling
What is the appearance of psoroptes ovis?
- Long legs
- Funnel shaped suckers
- 3 jointed pedicel
- Pointed mouthparts
- Rounded abdominal tubercles in male
What does psoroptes ovis cause?
Sheep scab, severe pruritis
What animals does psoroptes ovis affect?
Sheep and can affect cattle, but mites do not pass between sheep and cattle.
Why is psoroptes ovis hard to eradicate?
Can survive off host for 2 weeks
How can sheep scab be controlled?
Dips
Inject macrocyclic lactones
Quarantine new
What is the appearance of chorioptes bovis?
- Long legs
- Short unjointed pedicles
- Cup shaped pedicles
- Rounded mouthparts
- Truncate abdominal tubercles in male
Which animals does chorioptes bovis affect?
Commonly cattle
Horses
Why is chorioptes bovis difficult to eradicate?
Survives 3 weeks off host
How is chorioptes bovis different to psoroptes ovis?
Less pathogenic
Where are chorioptes located on the animal?
Lower legs
Base of tail peritoneum
Udder
Scrotum
What is the appearance of otodectes cynotis?
Long legs
Relatively large
No joined pretarsi
How can otodectes cynotis be distinguished from psoroptes ovis?
Smaller than psoroptes ovis
Which animals are affected and at which site by otodectes cynotis?
Cats and dogs
Around ear
Which mite causes demodicosis?
Demodex canis (also called demodex injar in dogs)
What is the appearance of demodex canis?
Small
Elongated
Cigar shaped
How can demodex canis pass to young?
Suckling
How is demodectic mange diagnosed?
Skin scrapes
Hair plucks
Skin biopsies
What is the appearance of cheyletielldae?
Large
Curved palpal claws
Genu on first legs
Which animals are affected by cheyletielldae?
Rabbits
Cats
Dogs
What does cheyletielldae cause?
Mild but highly contagious zoonosis
What is the scientific name of berry bugs?
Trombiculidae/Neotrombicula autumnalis
What is the appearance of berry bugs?
6 legged
Large
Orange/yellow larvae
What do berry bugs cause?
Pruritic skin disease
Name the 2 types of mesostigmatid.
Northern fowl/ornithonyssus sylvarium
Red mite/dermanyssus gallinae
Which animal does mesostigmatid affect?
Birds
Where is the lifecycle of northern fowl mite located?
Entire lifecycle on host, eggs at the base of feather
How long is the northern fowl mite lifecycle?
5-12 days
Where is the lifecycle of red mite located?
- Most lifecycle of host
- Feed at night
- 34 weeks off host survival
How long is the lifecycle of red mite?
7 day lifecycle
24 weeks off host survival
What are the clinical signs caused by mesostigmatid mites?
Irritant
Anaemia in severe cases
Death
Decreased egg production
What diseases can mesostigmatid mites transmit?
Salmonella
Mycoplasma
Avipox virus pathogens
How are mesostigmatid mites and their transmitted diseases managed?
Avoid wild birds
Deep clean
Isoxazolines
Pyrethroids
Avermectins
IGRs sprays
