What range describes the general body length for a substantial adult Christmas beetle specimen?
Answer
Generally measuring between 20 and 30 millimetres in length
Adult Christmas beetles are classified as substantial insects due to their physical dimensions. The established size range for these mature beetles falls between 20 and 30 millimetres when measured from head to tail. This considerable size makes them highly visible when they are flying or resting on surfaces, contributing to their recognition as conspicuous summer insects. This measurement is critical for identifying mature specimens, separating them from smaller or immature stages of related or different beetle species.

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