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telson
This term is a specialized anatomical descriptor used primarily in zoology and marine biology. It refers specifically to the terminal segment of the abdomen in arthropods, which may be modified into a spike, a fan, or a stinger depending on the species. Because it is a technical term, it is rarely encountered outside of scientific literature or academic discussions regarding invertebrate anatomy.
In a biological context, the telson is distinct from the uropods, which are the paired appendages flanking it. While the telson provides the primary structural end-point of the body, the uropods often work in tandem with it to facilitate rapid movement, such as the "tail-flip" escape response seen in many crustaceans.