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Flashcards in Arthropod 4 Deck (30):
1

True or False:
All bot flies cause obligatory myiasis of various organs.

TRUE

2

True or False:
Bot flies are not host specific.

FALSE

High host specific and site specific

3

What is the rodent skin bot?

Cuterebra

4

Where do Cuterebra flies lay there eggs?

Along rabbit runs and rodent burrows

5

Where, geographically, can cuterebra be found?

Throughout North America

6

How do Cuterebra enter their hosts?

Through some body opening

7

When would you expect to see lesions of Cuterebra on a dog or cat?

August, September, October

8

 Where are the body would cuterebra lesions most likely be?

Neck 

&

Shoulders

9

If there are no skin lesions, what other signs could develop with cuterebra?

Respiratory signs

&

Neurological signs

10

Nose bots:
What are they?

Oestrinae

11

The sheep nasal bot fly:

What is the genus and species?

Oestrus ovis

12

Females of Oestrus ovis are what, viviparous, oviparous, etc?

Larviparous

13

Oestrus ovis:
What are the symptoms?

Chronic nasal discharge

Head shaking

Paw at head

Loss of appetite

14

Oestrus ovis:

What is your treatment plan?

Ivermectin, orally

15

Where on the body might Hypoderma lay their eggs?

Glue eggs to the hair on the legs of cattle

16

At what time of year would you most likely see infections with the following:

  1. Hypoderma lineatum?
  2. Hypoderma bovis?

  1. Hypoderma lineatum : April - June
  2. Hypoderma bovis : June - September

17

How does Hypoderma get into the body?

Eggs hatch spontaneously in less than a week and larvae penetrate the skin directly or through a hair follicle.

18

Hypoderma lineatum OR Hypoderma bovis:

  1. Larvae migrate between fascial planes of muscle and along connective tissue.
  2. Larve follow nerves below the skin.
  3. Larve accumulate in the spinal canal.
  4. Larvae accumulate in the submucosa of the esophagus.
  5. Larvae migrate around the epideral space.
  6. Larvae form a hole in the skin surface.

  1. Hypoderma lineatum
  2. Hypoderma bovis
  3. Hypoderma bovis
  4. Hypoderma lineatum
  5. Hypoderma bovis
  6. Hypoderma bovis

19

Hypodermatinae:

  1. What is your medical treatment plan?
  2. When during the year will you treat?

  1. Ivermectin; Organophosphates
  2. Treat at the end of fly season (late August) prior to larva reaching the esophagus or spinal canal

20

The stomach bots:
What is the genus?

Gasterophilus spp.

21

Gasterophilus:
Obligate or falcultative parasites?

Obligate

22

Explain the life cycle of Gasterophilinae:

  • The first and second stage larvae spend one month in the oral cavity
  • They proceed to the stomach and duodenum where they remain for 9-10 months
  • They ultimately pass out in feces to pupate in the ground
  • Life cycle encompasses about 1 year

23

Where does Gasterophilus intestinalis lay their eggs?

Deposit eggs on the hairs of the forelegs and shoulders

24

Gastrophilus intestinalis:

What causes the eggs to hatch?

A sudden rise in temperature, moisture, and friction associated with grooming

25

Throat bot fly:
What is the genus and specis?

Gastrophilus nasalis

26

Gastrophilus nasalis:

Where does it lay its eggs?

Hairs of the intermandibular space

27

Lip bot fly:

What is the genus and species?

Gastrophilus hemorrhoidalis

28

Gastrophilus hemorrhoidalis:

Where does it deposit its eggs?

Hairs that adjoin the lips

29

Gastrerophilinae:

  1. What is your medical treatment plan?
  2. Which life cycle stage is this medication active against?

  1. Ivermectin
  2. Larval stages

30