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Flashcards in Mites Deck (38):
0

Which families of mites are considered mesostigmatid, and what does that imply?

Dermanyssidae, Macronyssidae, Halarachnidia
Mesostigmata - stigma in between legs 3 and 4

1

What hosts do dermanyssidae and macronyssidae mites parasitize

Birds and rodents, people in buildings when their normal hosts are removed (i.e. Rats exterminated or fledglings leave nest)

2

What hosts can Ornithonyces be found on

Birds - chickens and people who handle chickens

3

When would you likely find Dermanyssus on their avian hosts? Why?

Found on host at night - feed at night, hide during the day

4

Liponyssoides sangineus

Host
Associated Diseases

Host is house mouse
VEctor of rickettsial pox in humans

5

Which species have long and slender chelicerae with minute chelae

Liponyssoides
Dermanyssus

6

Ornithonyssus

Physical characteristics
Common species and their hosts
Associated diseases
Type of people affected

Chelicerae much stouter than those of dermanyssidae, readily visible chelae under ordinary magnification
O. Sylvarium - northern fowl mite
O. Bursa - tropical fowl mite
O. Bacoti - tropical rat mite - important in lab mice, intermediate host of ??????????

Stay on chickens and may feed on people handling chicken eggs

7

Ophionyssus natricis

Host
Treatment

Snakes
Ivermectin

9

Pneumonyssoides

Family
Host
Associated disease

Halarachnidia
Nasal and paranasal sinuses of dogs
P. caninum - chronic sneezing and epistaxis

10

Orthohalarachne

Family
Host

Halarachnidia
Respiratory tract of seals

11

Varroa destructor

Family
Host
Importance

Halarachnidia
Honey bee
Threat to US agriculture - honey production, pollination

12

What is the defining feature of astigmatids? What types of motes are astigmatids?

No breathing holes, breath through the skin.
Mange mites, some hair-clasping mites, 2 internal parasites of chickens and grain mites

13

What families are included in group, mange mites and what diseases are associated with them?

Sarcoptide, knemidocoptidae, Psoroptidae
Mange or scabies
Scabies - dermatitis characterized by pruritus, alopecia, and epidermal hyperplasia with desquamation. Rubbing and scratching may lead to oozing serum and blood.

14

Sarcoptes scabiei
Pretarsi characteristics
Associated disease and animals affected

Pretarsi with long unsegmented pedicels
Sarcoptic mange or scabies in humans, dogs, foxes, horses, cattle (reportable) and others.
Host specificity - when interspecific transmission occurs, resulting dermatitis is atypical and transient

15

Notoedres
Hosts
Pretarsi characteristics
Associated disease

Parasites of cats, rats, rabbits, occasionally and temporarily humans
Pretarsi have long unsegmented pedicels
Face mange in cats (Notoedres cati) starts on medial edge of pinna and spread to face, paws and hindquarters - alopecia, hyperkeratosis

16

Knemidokoptes
Species and their associated diseases
Animals affected

Knemidokoptes mutans - scaly leg in chickens, turkeys, pheasants and other galliinaceons birds - mites burrow in epidermis causing scales to lift and loosen, legs thickened and deformed

K. Pilae and K. Jamaicensis - mange od the legs, base of beak, vent area of parakeets, and back of canaries

17

Psoroptes
Pretarsi characteristics
Species, associated diseases and affected animals

Pretarsi have long, 3 segmented pedicels
Psoroptes ovis - psoroptic mange (reportable) in cattle, sheep and horses
Psoroptes cuniculi - ear canker in rabbits, less severe form of otis acariasis in goats and horses

18

Where on the skin does Psoroptes ovis live?

Does not burrow, but remains at base of hairs - pierce skin with stylet-like chelicerae
Resulting exudate on of serum hardens to form a scab

19

What are the Pretarsi characteristics of Chorioptes bovis?

Short unsegmented pedicels on first, second and fourth pairs of legs of the female and all the legs of the male

20

Chorioptes bovis

Hosts
Where on the host does this mite prefer to feed?
What do they eat?

Superficially dwelling
Preference for tail, escutcheon and legs of cattle, usually inflate winter, mildly pruritic
May be found on tail and legs of horses, sheep, and goats and in the ear canal of rabbits

21

What is the scientific name for ear mites?
Pretarsi characteristics
Hosts

Otodectes cynotis
Short unsegmented pedicels on first and second legs of the female and all legs of the male
Infests external ear canal and adjacent skin of dogs, cats, foxes, and ferrets causing intense irritation

22

Lynxacarus radovskyi

Family
Common name
Hosts
Geographic distribution

Astigmata
Hair-clasping mites
Domestic cats (cling to hairs imparting a scruffy appearance
Florida, Puerto Rico, Hawaii, Australia, Fiji

23

Demodex

Family
Physical characteristics

Prostigmata
Tiny worm-like mites with short, stubby legs

24

Name two species of demodex that live in the skin of the human face?
What portion the skin

Demodex folliculorum - hair follicles in human face
Demodex brevis - sebaceous glands in human face

25

Canine Demodex

Host
Transmission
Disease
Clinical signs

Comparison

Demodex canis: Present in small numbers on the skin of most normal dogs in hair follicle
Transferred from dams to puppies during nursing
Demodactic mange in immunodeficient puppies 3-6mo old
Circumscribed areas of erythema and alopecia around the eyes, mouth and over bony projections on the extremities. No evidence of pruritis.

D. injai: about twice the length of D. Canis
Mainly found in sebaceous glands
Dorsal seborrheic dermatitis

D. cornei: shorter and. Stouter than D. canis
Lives in stratum corneum
Signs similar to D. canis

26

Demodex cati

Disease severity and localization

Rarely noticed
Head and ear canals

27

Demodex gatoi

comparison to demodex cati

More superficially dwelling than D. cati, found in stratum corneum of cats.
Shorter and broader than D. cati

28

Demodex bovis

Host
Associated disease

Usually normal fauna of bovine skin: eyelids, vulva, scrotum
Can cause pinhead to egg sized nodules on neck and forequarters

29

Demodex phylloides

Host
Lesion
Localization

Pigs
Nodules around eyes and on snouts, later spread to underside of body

30

Demodex caprae

Host
Lesion

Milk goats
Nodular dermatitis

31

Chelyletiella

Species and their preferential host and associated disease

Cheyletiella yasguri: dogs, walking dandruff
Ch. blakei: cats
Ch. parasitivorax: rabbits

Humans may serve as accidental or transitory host

32

Psorogates

Family
Hosts and associated lesion

Prostigmata
Mice and primates
May cause mange-like condition

33

Myobiidae

Distinguishing features
Species and preferred host
Clinical signs
Causes of outbreak

first pair of legs modified for clasping hair

Myobia musculi - lab mice
Radfordia ensifera - lab rats

Alopecia and erythema of dorsal neck region, self inflicted damage in severe cases

Stress and overcrowding

34

Harpyrhynchidae

Hosts
Lesion and localization

Birds
Burrow in feather follicles or form large crusted cysts in skin

35

Syringophilidae

Host
Localization
Associated disease

Birds
Lumen of feather quills
Nonpathogenic

36

Trombiculidae

Larvae
Host and localization

Larvae called chiggers, only parasitic life stage
On skin or in ears of cats or dogs, or on faces or pasterns of ungulates, or under wings and around vents of birds

37

Tarsonemidae

Important species and it's host

Acarapis woodi - tracheal mite of honeybees

42

Pneumonyssus

Family
Host
Associated disease

Halarachnidia
Lung parenchyma of most (or all) Macaca mulatta monkeys (Pneumonyssus simicola)
Pulmonary acariasis - pinhead (or >) sized lesions with a whitish or yellow foci that have soft or empty centers and contain mites and a black pigment in the center