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Parasit Exam 3 > Insects 1 > Flashcards

Insects 1 Flashcards

1
Q

Arthropod Characterisitcs

A

Jointed limbs, Segmented body and exoskeleton

-Insects & Arachnids

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2
Q

Insects include…

A

Flies (Diptera)
Fleas (Siphonaptera)
Lice (Phthiraptera)
Bed bugs (Hemiptera)

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3
Q

Arachnids include…

A

Ticks and mites

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4
Q

Insect characteristics

A

Adults: 3 pairs of legs
Head, thorax, abdomen
Antenna

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5
Q

Diptera characteristics

A

(flies)

Antenna, Proboscis, 3 pairs of legs

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6
Q

Life cycle of Diptera

A

ELPA
Adults: irritate animal, feed on blood, transmit dz
Larvae/Instars: migrate in animal, feed on animal

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7
Q

Veterinary importance of Diptera

A
  • biological & mechanical transmission of organisms

- Fly strike

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8
Q

Siphonaptera lifecycle

A

(Fleas)

ELPA

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9
Q

Phthiraptera

A

(Lice)

  • Host specific
  • ENNNA
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10
Q

2 types of Phthiraptera

A

Anoplura and Ischnocera

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11
Q

Anoplura

A
  • sucking lice: suck blood, cause anemia
  • move slowly
  • head narrow than thorax
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12
Q

Ischnocera (Mallophaga)

A
  • Chewing lice: feed on skin surface; pruritus; secondary infections
  • move fast
  • head wider than thorax
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13
Q

Hemiptera

A

Bed bugs

-ENNNNNA

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14
Q

Musca domestica

  • Common name?
  • Host?
A
  • house fly

Hosts: domestic animals & humans

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15
Q

Musca domestica

-Identification

A
  • light to dark grey
  • sticky hairs on pads of legs
  • mouthparts fleshy adapted to sponging
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16
Q

Musca autumnalis

  • Common name?
  • Identification
  • LC
A
  • face fly
  • similar to house fly
  • eggs laid in feces or rotting organic material
17
Q

Musca autumnalis

-Sites of infestation

A

animal secretions and wounds

18
Q

Musca autumnalis

-Pathogenesis and lesions:

A
  • annoyance
  • mechanical vector of viruses, bacteria, helminths, protzoa
  • biological vector of Habronema & Draschia megastoma
19
Q

Musca autumnalis

-Clinical signs

A
  • annoyance can interfere with grazing
  • annoyance can result in a drop in performance
  • can result in eye disorders or conjunctivitis
20
Q

Stomoxys calcitrans

  • common name
  • hosts
A
  • stable fly, biting house fly

- most animals and humans

21
Q

Stomoxys calcitrans

-identification

A
  • mouthparts rigid, conspicuous and forward projecting

- sits on wall head up

22
Q

Stomoxys calcitrans

-LC

A
  • feeds on blood
  • requires 3 minutes to finish its blood meal
  • females lay eggs on decaying matter such as damp hay
23
Q

Stomoxys calcitrans

  • Pathogenesis and lesions
  • CS
A
  • attack animals, transmit dz organisms

- increased head and ear movement, skin twitches and tail swishes

24
Q

Stomoxys calcitrans

  • Dx
  • Tx
A
  • fly identification

- screens, sanitation; reduce breeding sites, insecticides, treat horse and environment, DO NOT treat compost

25
Q

Haematobia irritans

  • Common name
  • Hosts
A
  • horn fly

- cattle

26
Q

Haematobia irritans

-Identification

A
  • smallest bloodsucking muscids

- distinguish from stable fly being 1/2 size and shorter proboscis

27
Q

Haematobia irritans

-LC

A
  • remain on hosts except when females lay eggs in fresh feces
  • overwinter (diapause, pupa)
28
Q

Haematobia irritans

-Sites of infection

A
  • back in swarm
  • abdomen (belly) when raining
  • cluster around horns when not feeding
29
Q

Haematobia irritans

-Pathogenesis, lesions, CS

A
  • feed in thousands
  • cause intense irritation
  • impair milk production and weight gains
  • transmit cattle helminths
  • more than 200 flies leads to economic losses
30
Q

Haematobia irritans

-Tx & prevention

A
  • apply to host since fly remains on host most of the time

- insecticide resistance

31
Q

Culicoides

  • common names
  • host
A
  • Biting midges, “no-see-ums”

- all domestic animals and humans

32
Q

Culicoides

-identification

A
  • mottled wings, short piercing proboscis, antenna long and slender
  • only females take blood meals
33
Q

Culicoides

  • Pathogenesis and lesions
  • CS
A
  • annoyance
  • transmits protozoa, helminths and viruses
  • pain inflicted outweighs size of fly
  • allergic reaction in some horses
34
Q

Culicoides

  • Dx
  • Tx and prevention
A
  • fly identification
  • decrease standing water, avoid marshy pastures
  • tx horse: repellents, insecticides

Parasit Exam 3 (11 decks)

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