|Rocky Mountain wood tick|
Dermacentor andersoni, commonly known as the Rocky Mountain wood tick, is a species of tick. It can cause tick paralysis. This tick is well known as a vector of the Rocky Mountain spotted fever rickettsia in the northwestern U.S. and Canada, the Colorado tick fever virus, and the bacteria which causes tularemia (hunter's disease).
- The larva only has three pairs of legs.
- The nymph has four pairs.
- A single pair of spiracular openings (stigmata) are seen close to the coxae (leg bases or segments) of the fourth pair of legs (except in larvae).
- A terminal capitulum (mouthparts) is visible from above in all hatched stages.
- A large sclerite called the scutum is present dorsally behind the capitulum. The scutum almost entirely covers the back of the male, but only partly covers the back of the female.
- Eyes, if present, are on the scutum.
- Sexual dimorphism in size and colour is frequent. The female is often larger.
- The posterior margin of opisthosoma is usually subdivided into sclerites called festoons.
- The pedipalps are rigid along the chelicerae, and are not leg-like.
- Dergousoff SJ, Gajadhar AJ, Chilton NB (March 2009). "Prevalence of Rickettsia species in Canadian populations of Dermacentor andersoni and D. variabilis". Appl. Environ. Microbiol. 75 (6): 1786–9. doi:10.1128/AEM.02554-08. PMC 2655481. PMID 19151178.
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