Arthropod Overview Flashcards
why are arthropods of interest to us?
because of potential for causing disease
ways arthropod cause disease
annoyance (don’t gain, impacts production)
blood loss
dermatitis/ skin issues
allergic response
myasis (larval migration)
envenomation
what role do arthropods play in intermediate/ paratenic host
protozoa and helminths
what are the vectors of infectious disease for arthropods
viruses
rickettsia
bacteria
what are the 2 sub phylum for arthropods
chelicerata (ticks, mites, spiders)
mandibulata (flies, fleas, lice)
morphological characteristics of arthropods
jointed appendages
chitinous exoskeletons
segmented body
priminitive CNS
respiratory system
what are the portions of the segmented body in arthropods
cephalic
thoracic
abdominal
bilaterally symmetrical
what parts of arthropod morphology are phrenological targets
chitinous exoskeleton and primitive CNS
simple metamorphosis
form that emerges from egg looks like adult
same habitat throughout lifecycle
all stages are parasitic
complex metamorphosis
form that emerges from egg does not look like adult
may occupy different habitats throughout lifecycle
one stage is parasitic
trans-stadial transmission
parasites are transferred from one developmental stage to the other
tick becomes infected as larva/nymph and passes to next stage for transmission to hosts
-common among 3 host tick species
trans-ovarial (vertical) transmission
parasites transferred to adult that incorporates infection in her eggs
larvae that hatch from eggs are already infected
