What distinguishes red flour beetles from confused flour beetles?

The distinguishing feature of red flour beetles, specifically the distinct club formation in their antennae, sets them apart from confused flour beetles. Antennae are crucial for insects as they play a role in smell and sensing the environment. In red flour beetles, the antennae gradually thicken towards the tip, giving them a club-like appearance. This is a key identification trait that helps pest professionals differentiate between these two species, which can otherwise look quite similar.

Other options touch on characteristics and habits but do not accurately define the physical distinctions between the two beetles. The ability to fly is more about physical capability rather than a defining taxonomy feature. Similarly, while confused flour beetles might be more commonly found in certain situations, this does not establish a biological distinction. Identical characteristics do not apply, as both species do exhibit specific traits that allow for differentiation, with the clubbed antenna being a notable example.