Arthropod 4

Question 1

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

Answer 1

TRUE

Question 2

True or False:
Bot flies are not host specific.

Answer 2

FALSE

High host specific and site specific

Question 3

What is the rodent skin bot?

Answer 3

Cuterebra

Question 4

Where do Cuterebra flies lay there eggs?

Answer 4

Along rabbit runs and rodent burrows

Question 5

Where, geographically, can cuterebra be found?

Answer 5

Throughout North America

Question 6

How do Cuterebra enter their hosts?

Answer 6

Through some body opening

Question 7

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

Answer 7

August, September, October

Question 8

Where are the body would cuterebra lesions most likely be?

Answer 8

Neck

&

Shoulders

Question 9

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

Answer 9

Respiratory signs

&

Neurological signs

Question 10

Nose bots:
What are they?

Answer 10

Oestrinae

Question 11

The sheep nasal bot fly:

What is the genus and species?

Answer 11

Oestrus ovis

Question 12

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

Answer 12

Larviparous

Question 13

Oestrus ovis:
What are the symptoms?

Answer 13

Chronic nasal discharge

Head shaking

Paw at head

Loss of appetite

Question 14

Oestrus ovis:

What is your treatment plan?

Answer 14

Ivermectin, orally

Question 15

Where on the body might Hypoderma lay their eggs?

Answer 15

Glue eggs to the hair on the legs of cattle

Question 16

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

1. Hypoderma lineatum?
2. Hypoderma bovis?

Answer 16

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

Question 17

How does Hypoderma get into the body?

Answer 17

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

Question 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.

Answer 18

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

Question 19

Hypodermatinae:

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

Answer 19

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

Question 20

The stomach bots:
What is the genus?

Answer 20

Gasterophilus spp.

Question 21

Gasterophilus:
Obligate or falcultative parasites?

Answer 21

Obligate

Question 22

Explain the life cycle of Gasterophilinae:

Answer 22

• 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

Question 23

Where does Gasterophilus intestinalis lay their eggs?

Answer 23

Deposit eggs on the hairs of the forelegs and shoulders

Question 24

Gastrophilus intestinalis:

What causes the eggs to hatch?

Answer 24

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

Question 25

Throat bot fly:
What is the genus and specis?

Answer 25

Gastrophilus nasalis

Question 26

Gastrophilus nasalis:

Where does it lay its eggs?

Answer 26

Hairs of the intermandibular space

Question 27

Lip bot fly:

What is the genus and species?

Answer 27

Gastrophilus hemorrhoidalis

Question 28

Gastrophilus hemorrhoidalis:

Where does it deposit its eggs?

Answer 28

Hairs that adjoin the lips

Question 29

Gastrerophilinae:

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

Answer 29

1. Ivermectin
2. Larval stages