Silverfish (likely)

Dark, humid indoor areas such as bathrooms, basements, kitchens, and wall or floor crevices.

Feeds on carbohydrates and cellulose, including starches, paper, book bindings, wallpaper paste, fabrics, and crumbs; it may also consume dead insects.

Fast-running, wingless, and primarily nocturnal; it hides in cracks during daylight and can survive for years, developing gradually without a pupal stage. The image appears to show a silverfish, though fine details are indistinct.

It does not bite, sting, transmit disease, or harm people. Larger infestations can damage paper, textiles, wallpaper, and stored items; it also helps recycle organic debris.