Review: Arthropoda Flashcards
2 catagories of life cycles
- Simple or incomplete metamorphosis
2 Complex or complete metamorphosis
Simple or incomplete metamorphosis overview
- egg > several nymphal stages (N1to Nn) > adult
Complex or complete metamorphosis overview
- egg > larval stages (L1, L2, etc.) > pupa > adult
Seed tick or insect?
Seed tick (= Larval tick)
* 3 pairs of legs
* No wings
* 2 body divisions (capitulum & body)
Insect
* 3 pairs of legs
* Sometimes wings (usually 2 pairs)
* 3 body divisions (head, thorax, abdomen)
Tick or mite?
Both belong to the class Arachnida so how do you tell them apart?
- METHOD 1: Mites are “mighty small” and ticks tend to be larger
HOWEVER the largest mites and smallest larval ticks overlap in size * If using general size for identification note the number of legs! Remember, larval ticks only have 3 pairs of legs while adult mites will have 4 pairs of legs - METHOD 2: Look at the hypostome on the capitulum, if it is armed it is a tick, if it is unarmed it is a mite
how do flies transmit pathogens?
- Transmission caused by incidental transport of pathogens between
hosts
Horse flies and deer flies have what kind of mouth parts and are what kind of eaters?
How do they pass on pathogens?
- Horse flies and deer flies have slicing mouthparts and are messy eaters.
- Pooling blood at feeding sites can coat the mouth parts allowing for transmission of infected blood between animals during subsequent feedings
what kind of pathogen transmission do houseflies facilitate and why?
- House flies are especially effective at promoting fecal-oral transmission due to a combination of their feeding habits and hairy bodies
lesions caused by Cuterebra spp.
– formation of subcutaneous fibrotic cyst, in rare cases larvae can enter the CNS
lesions caused by Gasterophilus spp.
– gastric lesions, in rare cases perforations can occur giving abscesses and peritonitis
Myiasis
- Invasion of healthy (obligate) or damaged (facultative) flesh by the larvae of dipteran flies
