This specimen is a fossilized crab (Harpactoxanthopsis bidentatus) from Yangjiang, notable for its well-preserved carapace and claws. The dorsal shell, chelae, and portions of the walking legs remain visible, with mineralization giving the surface a natural blend of grayish-white and brown tones. Distinctive spines and surface textures characteristic of the species are still recognizable, reflecting the crab’s original morphology. As a typical crustacean fossil from Cenozoic strata, it holds both scientific significance for paleoenvironmental studies and aesthetic value for collectors. The fossil of Harpactoxanthopsis bidentatus dates back to the Paleogene period of the Cenozoic Era, approximately 34 to 56 million years ago. These fossils reflect the diverse crustacean fauna that thrived in warm, shallow marine environments of that time.