Which feature characterizes the Saw-Toothed Grain Beetle?

The Saw-Toothed Grain Beetle is characterized by its pronotum, which features six prominent, saw-like teeth on each side. This unique physical trait is a defining characteristic that helps in identifying this beetle species among others. In addition to its distinct dental features, the Saw-Toothed Grain Beetle is relatively small and lacks the ability to fly, which differentiates it from other beetles that may possess wings and other adaptations for flight. The combination of these physical traits—specifically the six teeth and the absence of flight capability—solidifies the identification of this beetle.

This contrasts with the other options, which either describe different insects or inaccurately present features that do not align with the Saw-Toothed Grain Beetle's identification. For instance, descriptions that imply smooth elytra or pointy rear wings are not representative of this species.