Flashcards in Ectoparasites intro Deck (19)
What are features of arthropods?
6 or 8 limbs
Chitinous cuticle (waterproof exoskeleton)
Segmented body (2 or 3)
Body cavity containing lymph
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)
How many legs do arachnids have?
8 in adult
6 in larvae
What do arachnids lack that insects have?
Wings (not all insects)
What are in the insect class?
What are in the arachnid class?
Why do flies pester cattle and mosquitoes/ticks suck blood?
Obtain protein to mature eggs
How do ectoparasites grow?
Under influence of juvenile hormones
What is the body cavity of insects containing the circulatory fluid?
Contains circulatory fluid
What is the name of the sperm packet used for reproduction in mites and ticks (arachnids)
How do insects respire? What are they called?
Openings in protective cuticle
Insects - spiracles
Arachnids - stigmata
The insect GI system has Malpighian tubules. What are these?
Tubules that filter waste from haemolymph into the gut
Describe the nervous system in insects
What are the specialised teeth found in ticks?
What are the 2 types of ectoparasite life cycle?
Holometabolous - complete metamorphis
Hemimetabolous - incomplete metamorphis, larvae/nymph similar to adults
Give an example of a holometabolous species
What negative effect can ectoparasites have?
Pathogen vectors = disease
Tissue invasion, blood loss, inflammation and pruritis
Why are ectoparasites a modern problem?
Intensification of husbandry systems
Increased live stock density
Warm environment in houses