Studied by 3 people
What role do the microfilariae play in the heartworm lifecycle?
They are embryonic stages that must develop in mosquitos before becoming infective to canine hosts
What is the largest phylum?
Phylum Arthropoda
Phylum Arthropoda makes up what percentage of all known species of animals?
~84%
How many described species are in Phylum Arthropoda?
~1.2 million
Estimates of ~5-10 million individual species
What makes Phylum Arthropoda biotically diverse?
Body forms
Habitats/niches
Adaptations - intersexuality, gynandromorphy, hermaphroditism
Why are arthropods of interest in vet med?
Because of their potential for causing disease
Annoyance - fly annoyance on grazing cattle leads to production losses
Blood loss - small ruminants - mosquito storm
Dermatitis - result from mites and fleas
Allergic Response - meat allergy from ticks
Myasis (larval migration) - eye damage from migration of larval flies
Envenomation - wasps, spider (brown recluse)
Arthropods play an important role as intermediate/paratenic hosts for what?
Protozoa - Obligate Intermediate - flies
Helminths
Arthropods are vectors of infectious disease for what?
Viruses - transmitted by mosquitoes
Rickettsia
Bacteria
What are the Subphylums of Phylum Arthropoda?
Chelicerata and Mandibulata
What class is associated with Subphylum Chelicerata?
Arachnida - ticks, mites, spiders
What class is associated with Subphylum Mandibulata?
Insecta - bugs, flies, fleas, lice
What are the morphologic characteristics of arthropods?
Jointed appendages
Chitinous exoskeleton
Segmented body
Primitive CNS
Respiratory System
What makes up the segmented body of an arthropod?
Cephalic
Thoracic
Abdominal
Bilaterally symmetrical
What are the 2 forms of developmental biology associated with Arthropods?
Simple metamorphosis and Complex metamorphosis
How is simple metamorphosis of arthropods described?
“Form emerging from egg looks like the adult”
Does an arthropod going through simple metamorphosis occupy different habitats?
No - occupies the same habitat throughout lifecycle
How is complex metamorphosis of arthropods described?
“Form emerging from egg looks nothing like the adult”
Does an arthropod going through complex metamorphosis occupy different habitats?
Yes - may occupy different habitats throughout the lifecycle
What are the 2 ways in which transmission occurs with arthropods?
Trans-stadial → most common among 3 host tick species
Trans-ovarial (vertical transmission)
What type of transmission occurs when parasites and other microorganisms are transferred from 1 developmental stage to the other?
Trans-stadial Transmission
What type of transmission occurs when parasites and other microorganisms are transferred to the adult who incorporates the infection in her eggs?
Trans-ovarial (Vertical) Transmission
T or F: Arthropods are capable of causing disease in animals and humans.
True
T or F: Arthropods play an important roles in the transmission of parasitic infection as facilitative host.
False
*Intermediate/paratenic hosts
T or F: Arthropods are not important vectors of infectious disease in all host populations.
False
Note
Flashcard