Which physical structure is absent on Ixodes genus members like I. pacificus?
Answer
Festoons
A key characteristic used to categorize members of the Ixodes genus, including *I. pacificus*, is the anatomical feature that is missing from their bodies. Specifically, these ticks lack festoons. Festoons are recognizable as small grooves or scalloping structures that are frequently found along the posterior margin of the bodies of certain other tick species. Observing this absence, even with relatively low levels of magnification, serves as an important diagnostic clue to confirm identification within the *Ixodes* group.
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