Arachnid Flashcards

ARTHROPODS WIKIBUGS FLASHCARDS

Deer tick - Scott Bauer

Arachnids

Question	Answer	Article
What are the two divisions of the arachnid body?	Cephalo-thorax Abdomen	Link to Answer Article
Summarise the arachnid life cycle	Larvae emerge from the egg Nymphal stage follows the larval stage Nymph undergoes ecdyses forming the adult	Link to Answer Article

Ticks

Question	Answer	Article
What are seed ticks?	Tick larvae	Link to Answer Article
How can you differentiate hard ticks from soft ticks?	Soft ticks have no scutum The mouthparts are not visible from the dorsal surface of soft ticks Hard ticks have festoons Hard ticks can be ornate	Link to Answer Article
True or False: Soft ticks can swell up to three times their body size whilst taking a blood meal	False Soft ticks feed little and often and cannot expand to three times their body size whilst feeding Female hard ticks can swell up to three times their body size whilst engorging on a blood meal	Link to Answer Article
List the mouthparts of ticks	Hypostome Chelicerae Palps	Link to Answer Article
Fill in the missing words about soft and hard ticks	Soft ticks feed little and often and on many hosts. Hard ticks take one blood meal at each life cycle stage and can feed on one, two or three different hosts during their life cycle.	Link to Answer Article
What is trans-ovarian transmission and give an example of a species of tick which uses this	Infection is passed from one generation of ticks to the next through the egg Babesia	Link to Answer Article
What is trans-stadial transmission?	Parasite or microbial organism is ingested during feeding Organism passed onto the next host as the tick develops (only in two and three host ticks) It is not passed onto the next generation through the egg	Link to Answer Article
What is the most important tick species in the UK, how many hosts does it feed upon and what disease can it spread?	Ixodes species 3 host tick Transmits Lyme Disease	Link to Answer Article
What climate does Rhipicephalus species prefer and what is it a vector for?	Warmer climates Theileria parva for East Coast Fever Babesia bigemina Babesia canis and Ehrlichia canis	Link to Answer Article
Name some important soft ticks	Argas species Ornithodorus species Otobius species	Link to Answer Article
What are the main methods of tick control?	Killing ticks on the ground Separate the host from infection Killing ticks on the host Enhancing stock resistance	Link to Answer Article

Mites

Question	Answer	Article
How many pairs of legs do adult and nymph mites have respectively?	Adults have 4 pairs of legs Nymphs have 3 pairs of legs	Link to Answer Article
What is the main feature which distinguishes burrowing mites from non-burrowing mites?	Burrowing mites have short legs which project only a small distance from the body Non-burrowing mites have longer legs	Link to Answer Article
Is Sarcoptes as burrowing or non-burrowing mite?	Buurrowing	Link to Answer Article
What clinical signs present in an infection caused by Sarcoptes mites?	Erythema with papule formation Intense pruritis Wrinkling and thickening of the skin Scabies Rash may present if a hypersensitivity reaction develops	Link to Answer Article
Which species are affected by Knemidocoptes mites?	Avians	Link to Answer Article
What are the three main species of Knemidocoptes mites and what conditions do they cause?	K. mutans Causes scaly leg K. gallinae Causes depluming itch K. pilae Causes scaly face and beak	Link to Answer Article
Which species do Trixacarus mites affect and how long can it take before the infection causes death?	Labaratory rodents 3-4 months after infection	Link to Answer Article
What shape are Demodex mites?	Cigar shaped	Link to Answer Article
What are the two types of demodecosis caused by Demodex mites?	Pustular Skin invasion by Stapylococcus. More serious infection Squamous Dry reaction Less serious	Link to Answer Article
What species do Notoedres mites affect?	Cats Rats Humans Rabbits Tropical bats	Link to Answer Article
What are the main species of non-burrowing mites of veterinary importance?	Chorioptes Psoroptes Otodectes Cheyletiella Dermanyssus Ornithonyssus Trombicula Leporacarus Varroa Forage mites	Link to Answer Article
Do Psoroptes mites have segmented or unsegmented pedicles?	Segmented	Link to Answer Article
What are the two main Psoroptes mites of veterinary importance?	P. cuniculi Affects labaratory and pet rabbits P. ovis Causes sheep scab	Link to Answer Article
Do Chorioptes mites have segmented or unsegmented pedicles and what is the main species of veterinary importance?	Unsgmented C. bovis	Link to Answer Article
Which non-burrowing mite causes otitis externa in dogs?	Otodectes cynotis	Link to Answer Article
Which non-burrowing mite causes walking dandruff?	Cheyleteilla	Link to Answer Article
What is Dermanyssus gallinae better known as and does it spend most of its time on or off its host species?	The poultry red mite Spends most of its time off of the host	Link to Answer Article
Which mites are often found in feed stores and bedding and what problems do they cause?	Forage mites Causes respiratory distrubances and skin reactions	Link to Answer Article
To which industry do Varroa destructor pose a major problem?	Honeybee farming	Link to Answer Article