What is the defining color pattern of an unfed adult female I. pacificus?
Answer
A brown-black scutum contrasted by an orange abdomen
The physical appearance of the unfed adult female Western Blacklegged Tick exhibits a specific and contrasting coloration that aids in identification, especially when compared to the Eastern counterpart. The anterior portion, covered by the scutum, presents a brown-black color. This is sharply juxtaposed against a pronounced orange abdomen, which occupies the rear section of the body, allowing for the massive expansion required for egg production once feeding begins. This orange coloration is a key differentiator from the Eastern tick female, which is generally described as brown to reddish-orange overall.
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