Arthropods

Question 1

Why is Class Insecta under Phylum Arthropoda of Veterinary importance?

Answer 1

Agents of dz
May produce venom or toxic substances
Can be IH for protozoan or helminth parasites
Can be vectors for bacteria, viruses, etc

Question 2

Characteristics of adult insects

Answer 2

Segmented body w/ 3 pairs  of segmented legs
Dorsal heart,  ventral spinal cord 
Complete digestive system 
Excretory system 
Reproductive system

Question 3

Describe the insect body

Answer 3

Head
Thorax
Abdomen

Question 4

Simple(incomplete) metamorphosis

Answer 4

Egg, nymph adult

Nymph resembles adult but not sexually mature

Question 5

Complex (complete) metamorphosis

Answer 5

Egg-larva-pupa-adult

Each stage is different than the others

Question 6

Name the 4 orders and common names of its members in Class Insecta

Answer 6

Order Diptera = 2-winged true flies

Order Anoplura = sucking lice

Order Mallophaga = chewing lice

Order Siphonaptera = fleas

Question 7

Are members of Order Diptera permanent or temporary ectoparasites?

Answer 7

Both, permanent as an adult and temporary when acquiring blood meals

Question 8

Facultative Myiasis

Answer 8

Normally deposit eggs into garbage, feces, rotting etc

Occasionally deposited eggs in contaminated wounds, larva eats necrotic tissue

Question 9

Obligatory Myiasis

Answer 9

Larvae must use animal host to complete life cycle

Uses living tissue, organs, uncontaminated wounds, soft tissue

Question 10

3 examples species of obligatory myiasis

Answer 10

Cochliomyia hominivorax
Hypoderma spp
Dermatobia hominis

Question 11

3 examples of facultative myiasis

Answer 11

Flesh flies - sarcophaga
House flies - must domestica
Blow flies - Caliphora

Question 12

What do larvae use to breath?`

Answer 12

Spiracles at posterior end

Question 13

In what family is the mosquito?

Answer 13

Family culicidae

Question 14

Family Culicidae, general larval habitat and breathing apparatus

Answer 14

Always aquatic

Breathing via spiracles

Question 15

What is the most prominent blood suckling Diptera

Answer 15

Mosquito

Question 16

Describe male antennae or Family Culicidae

Female

Answer 16

Male = Plumose 
Female = Pilose

Question 17

What kind of lifecycle do mosquitoes have?>

Answer 17

Complex/complete

Egg-larva-pupa- adult

Question 18

What are the two subfamilies of Family Culicidae

How do you tell them apart?

Answer 18

Anophenline and Culcine

Anopheline resting position at angle to host

• eggs with floats
• no larval air tube, parallels to water

Culcine resting position parallel to host

• rafts on water surface
• larval air tube at angle to water surface

Question 19

What is anopheline a vector/IH for?

Answer 19

Plasmodium

Question 20

What is Culcine a vector for?

Answer 20

Yellow fever, dengue fever, west nile

Question 21

Name 2 species of Family Tabanidae

Answer 21

Tabannus app = horse fly

Chrysops = deer fly

Question 22

For what are horse and deer flies a

Intermediate host?

Vectors

Answer 22

IH = Trypanosoma theileri in cattle, Elaeophora schneideri in sheep

Vectors= Anaplams sp , anthrax, equine infections anemia

Question 23

What is the general life cycle of Tabunus and Chrysops

Answer 23

1. Egg deposited on water edge
2. Larvae hatch, enter water, sink to mud below
3. Larvae feed
4. Larvae pupate on dry ground along water edge
   6 adult emerge, mate and feed

Question 24

What is the major difference between the Tabanus larvae and the Chrysops larvae?

Answer 24

Tabanus larva are voracious predators = feed on frogs and annelids

Chrysops larvae feed on vegetation

Question 25

what family is the stable fly part of

Answer 25

Stomoxys calcitrans Family Muscidae

Question 26

How does Stomoxys calcitrans differ from Tabunus, Chysops, and anopheline and culcine with regard to blood meals

Answer 26

Both male and female are blood feeders - in their insects mentioned only the female feeds on blood