Mites

Question 0

What hosts do dermanyssidae and macronyssidae mites parasitize

Answer 0

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

Question 1

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

Answer 1

Dermanyssidae, Macronyssidae, Halarachnidia

Mesostigmata - stigma in between legs 3 and 4

Question 2

What hosts can Ornithonyces be found on

Answer 2

Birds - chickens and people who handle chickens

Question 3

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

Answer 3

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

Question 4

Liponyssoides sangineus

Host
Associated Diseases

Answer 4

Host is house mouse

VEctor of rickettsial pox in humans

Question 5

Which species have long and slender chelicerae with minute chelae

Answer 5

Liponyssoides

Dermanyssus

Question 6

Ornithonyssus

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

Answer 6

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

Question 7

Ophionyssus natricis

Host
Treatment

Answer 7

Snakes

Ivermectin

Question 9

Pneumonyssoides

Family
Host
Associated disease

Answer 9

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

Question 10

Orthohalarachne

Family
Host

Answer 10

Halarachnidia

Respiratory tract of seals

Question 11

Varroa destructor

Family
Host
Importance

Answer 11

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

Question 12

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

Answer 12

No breathing holes, breath through the skin.

Mange mites, some hair-clasping mites, 2 internal parasites of chickens and grain mites

Question 13

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

Answer 13

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.

Question 14

Sarcoptes scabiei
Pretarsi characteristics
Associated disease and animals affected

Answer 14

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

Question 15

Notoedres
Hosts
Pretarsi characteristics
Associated disease

Answer 15

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

Question 16

Knemidokoptes
Species and their associated diseases
Animals affected

Answer 16

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

Question 17

Psoroptes
Pretarsi characteristics
Species, associated diseases and affected animals

Answer 17

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

Question 18

Where on the skin does Psoroptes ovis live?

Answer 18

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

Question 19

What are the Pretarsi characteristics of Chorioptes bovis?

Answer 19

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

Question 20

Chorioptes bovis

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

Answer 20

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

Question 21

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

Answer 21

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

Question 22

Lynxacarus radovskyi

Family
Common name
Hosts
Geographic distribution

Answer 22

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

Question 23

Demodex

Family
Physical characteristics

Answer 23

Prostigmata

Tiny worm-like mites with short, stubby legs

Question 24

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

Answer 24

Demodex folliculorum - hair follicles in human face

Demodex brevis - sebaceous glands in human face

Question 25

Canine Demodex Host Transmission Disease Clinical signs Comparison

Answer 25

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

Question 26

Demodex cati Disease severity and localization

Answer 26

Rarely noticed | Head and ear canals

Question 27

Demodex gatoi comparison to demodex cati

Answer 27

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

Question 28

Demodex bovis Host Associated disease

Answer 28

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

Question 29

Demodex phylloides Host Lesion Localization

Answer 29

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

Question 30

Demodex caprae Host Lesion

Answer 30

Milk goats | Nodular dermatitis

Question 31

Chelyletiella Species and their preferential host and associated disease

Answer 31

Cheyletiella yasguri: dogs, walking dandruff Ch. blakei: cats Ch. parasitivorax: rabbits Humans may serve as accidental or transitory host

Question 32

Psorogates Family Hosts and associated lesion

Answer 32

Prostigmata Mice and primates May cause mange-like condition

Question 33

Myobiidae Distinguishing features Species and preferred host Clinical signs Causes of outbreak

Answer 33

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

Question 34

Harpyrhynchidae Hosts Lesion and localization

Answer 34

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

Question 35

Syringophilidae Host Localization Associated disease

Answer 35

Birds Lumen of feather quills Nonpathogenic

Question 36

Trombiculidae Larvae Host and localization

Answer 36

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

Question 37

Tarsonemidae Important species and it's host

Answer 37

Acarapis woodi - tracheal mite of honeybees

Question 42

Pneumonyssus Family Host Associated disease

Answer 42

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