Cicada exoskeleton still there after 10 months

The cicada skins are predominantly chitin, also found in the cell walls of fungi (as well as yeasts and algae) and in the exoskeletons of insects and other arthropods. Chitin is essentially a fiber and is similar to cellulose in plants, and which is second only to cellulose as the most common structural component of the world's flora and fauna.  They are a commonly used ingredient in Chinese medicine formulations.