Which beetle is characterized by having six teeth on each side of its pronotum?

The beetle that is characterized by having six teeth on each side of its pronotum is the sawtoothed grain beetle. This particular feature is significant as it helps in the identification of the species. The sawtoothed grain beetle's unique tooth pattern along the edges of the pronotum is a definitive characteristic that sets it apart from other beetles.

In addition to the teeth on the pronotum, the sawtoothed grain beetle has a relatively flat and elongated body, which is typically light brown, allowing it to easily navigate through grains and stored products, where it often resides. Its ability to infest dried foods makes it a common pest in pantry situations.

The other beetles listed do not share this distinct contour of teeth on each side of the pronotum. For example, the drugstore beetle and true powder post beetle have different identification marks, and the deathwatch beetle is known for its own unique characteristics that do not include the described tooth pattern. Thus, the defining feature of six teeth allows for accurate identification of the sawtoothed grain beetle among other species.