How are the elytra of the Devil's Coach Horse beetle unique among most beetles?

Answer

They cover only the first few abdominal segments.

The rove beetle possesses hard, protective wing cases (elytra) that are unusually short, covering only the first few abdominal segments, unlike most beetles where the elytra cover the whole abdomen.

How are the elytra of the Devil's Coach Horse beetle unique among most beetles?
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