Dorsal shield of sclerotized cuticle in ixodid or “hard” ticks. The scutum is present in all stages and occupies about one-third of the anterior dorsal surface of females, nymphs, and larvae and the entire dorsal surface in males ( Ticks, Figs. 4, 5, and 6A). In female and immature ixodid ticks, the remaining, extensible dorsal surface is called the alloscutum (Fig. 1).
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