What is a distinguishing feature of the Cerambycidae family of beetles?

A distinguishing feature of the Cerambycidae family is that they are commonly referred to as 'longhorn' beetles. This name stems from the notably long antennae that these beetles possess, which can often extend significantly beyond their body length. This characteristic is particularly pronounced in many species within the family, giving them a distinctive appearance that sets them apart from other beetle families.

While the other options mention various features related to beetles and their behavior or classification, they do not specifically define the Cerambycidae in the same clear manner as the name 'longhorn' beetles. For instance, flattened larval thoraxes and the nickname 'metallic wood borers' may apply to other groups or don't capture the unique physical characteristic of long antennae that is so central to the identity of Cerambycidae. Therefore, recognizing them as 'longhorn' beetles is essential in understanding their classification and visual traits.