Ixodes scapularis
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[Photo] Common Deer Tick (Ixodes scapularis). Source: http://www.ars.usda.gov/is/graphics/photos/mar98/k8002-3.htm Image Number: K8002-3. Credits: Photo by Scott Bauer. Rights: public domain.

Ixodes scapularis, known as the deer tick or black-legged tick, is a hard-bodied tick (family Ixodidae) of the eastern and northern Midwestern United States. It is a vector for several diseases of animals and humans (e.g., Lyme disease, babesiosis, ehrlichiosis, etc).

http://en.wikipedia.org/wiki/Ixodes_scapularis

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