Tetropium fuscum (Brown Spruce Longhorn Beetle) is a species of beetles in the family long-horned beetles. They are native to Turkey, Japan, Southern Europe, Northern Europe, Russia, and central europe.
Definition: Eye-spots which may be set into a pit to reduce the angles of light that enters, to allow the organism to deduce the angle of incoming light. Lens-like structures may be present, but stemmata, unlike lens eyes, cannot form an image, either for lack of refractive power or retinal resolution.
