Ectoparasites intro Flashcards Preview

Parasitology - Ectoparasites > Ectoparasites intro > Flashcards

Flashcards in Ectoparasites intro Deck (19)
Loading flashcards...
1

What are features of arthropods?

6 or 8 limbs
Chitinous cuticle (waterproof exoskeleton)
Segmented body (2 or 3)
Body cavity containing lymph

2

What are the 2 classes of arthropods? How many legs and body regions do they have?

Insects - 6 legs, 3 distinct body regions (head, thorax, abdomen)
Arachnids - 8 legs, 2 body regions (cephalothorax and abdomen)

3

How many legs do arachnids have?

8 in adult
6 in larvae

4

What do arachnids lack that insects have?

Wings (not all insects)
Antennae

5

What are in the insect class?

Flies
Lice
Fleas

6

What are in the arachnid class?

Mites
Ticks

7

Why do flies pester cattle and mosquitoes/ticks suck blood?

Obtain protein to mature eggs

8

How do ectoparasites grow?

Ecdysis (moulting)
Under influence of juvenile hormones

9

What is the body cavity of insects containing the circulatory fluid?

Haemocoele
Contains circulatory fluid

10

What is the name of the sperm packet used for reproduction in mites and ticks (arachnids)

Spermatophore

11

How do insects respire? What are they called?

Openings in protective cuticle
Insects - spiracles
Arachnids - stigmata

12

The insect GI system has Malpighian tubules. What are these?

Tubules that filter waste from haemolymph into the gut

13

Describe the nervous system in insects

Ganglia (brain)
Sensory organs

14

What are the specialised teeth found in ticks?

Hypsotome

15

What are the 2 types of ectoparasite life cycle?

Holometabolous - complete metamorphis
Hemimetabolous - incomplete metamorphis, larvae/nymph similar to adults

16

Give an example of a holometabolous species

Diptera (flies)

17

What negative effect can ectoparasites have?

Pathogen vectors = disease
Decreased production
Welfare implications
Tissue invasion, blood loss, inflammation and pruritis

18

Why are ectoparasites a modern problem?

Intensification of husbandry systems
Increased live stock density
Warm environment in houses
Artificial selection

19

Are ectoparasites one or two sexes?

Two - dioecious