This is a genuine distal caudal chevron bone from Stegosaurus sp. (Family: Stegosauridae), one of the most iconic herbivorous dinosaurs of the Late Jurassic period. Chevron bones—also known as haemal arches—are paired bones located beneath the tail vertebrae of many reptiles and dinosaurs. These bones helped protect vital blood vessels and supported tail muscles, contributing to both tail mobility and defensive capabilities. In Stegosaurus, the tail may have been used as a weapon (the famous “thagomizer”), making chevrons a key part of its functional anatomy. This specific specimen is from the distal (far) end of the tail, a region where chevrons are particularly slender and delicate, and thus rarely preserved or found intact. Fossils from this portion of the skeleton are uncommon, making this a rare and scientifically interesting piece for collectors, educators, or institutions. Unearthed from the Morrison Formation, a world-renowned Jurassic fossil bed in the western United States, this bone is approximately 150 million years old and shows excellent preservation for its type. Species: Stegosaurus sp. Class: Reptilia Family: Stegosauridae Geological Formation: Morrison Formation, Utah Age: Late Jurassic (~150 million years ago) Element: Distal caudal chevron (tail bone) 12,5 x 6 x 2,5 cm Totally natural, glued in 3 points. A rare opportunity to own a unique part of dinosaur anatomy that played a vital role in tail structure and movement.