thoracic leg

The thoracic legs of crustaceans are appendages attached to the thorax, and their form and function can vary greatly. In many malacostracans, these legs are adapted for walking, and in some, like lobsters, one or more pairs are modified into pincer-like claws called chelae. The structure of these legs is typically biramous, meaning they have two branches, though some have evolved to be uniramous by losing one branch.12

Crustaceans, a diverse group of arthropods, include familiar animals like shrimp, lobsters, and crabs. These creatures utilize their thoracic legs for a variety of purposes, including locomotion, feeding, and in some species, reproduction. The specific modifications of these legs are key to distinguishing between different crustacean groups.31