Which feature is specific to the sawtooth grain beetle?

The sawtooth grain beetle is specifically recognized by the distinctive six sawtooth projections on each side of its thorax. This unique anatomical feature sets it apart from other beetles. The sawtooth projections give it its name and are an important characteristic used in identifying this species.

While the presence of a long snout might be notable in some beetle species, this is not a feature of the sawtooth grain beetle. Additionally, although it is indeed common in homes, this characteristic does not uniquely identify the beetle, as many pests can be found in residential areas. The ability to fly strongly is also not a defining feature of this beetle, as its behavior and movement are more associated with navigating through stored products where it infests. Thus, the unique sawtooth projections are what truly define the sawtooth grain beetle.