Anatomy guideWorldwide

What is a tick scutum?

The scutum is the hard shield on the upper surface of a hard tick. Its shape, pattern and relative size can help with identification.

Reviewed by VuxLore® Knowledge Team For Everyone

Short answer

The scutum is the hard shield on the upper surface of a hard tick. Its shape, pattern and relative size can help with identification.

At a glance

In many hard-tick species the scutum covers most of an adult male's back but only the front portion of an adult female, allowing her body to expand while feeding.

Key takeaways

• Only hard ticks have a scutum.

• Scutal markings can support identification.

• A scutum alone is not enough to identify every specimen.

A useful anatomical landmark

The scutum is comparatively rigid and does not expand like the softer body behind it. This contributes to the different appearance of feeding males and females in many species.

Use several features

Specialists may also examine mouthparts, grooves, festoons, eyes and other small structures. Poor focus, damage or engorgement can hide these details, so avoid relying on a single photograph when certainty matters.