Cheliped
A claw-bearing appendage in many crustaceans, formed from a limb pair whose enlarged pincers are used for feeding, defense, or display.
Decapoda: An order of crustaceans with five pairs of thoracic walking legs, including crabs, lobsters, and shrimp. Chelipeds are characteristic appendages of many decapods, formed from the first pair of walking legs.
Chela: A pincer formed by a movable finger closing against a fixed finger at the end of an appendage. The chela is the claw-bearing terminal structure that gives a cheliped its name.
Feeding in decapods: The use of decapod appendages and mouthparts to capture, handle, and process food. Chelipeds seize prey and manipulate food before it reaches the mouthparts.
Pereopod: A thoracic appendage in a crustacean, often used for walking or handling food. A cheliped is a specialized pereopod, while many pereopods lack a pincer.
Arthropod: An invertebrate animal with a segmented body, jointed appendages, and an external skeleton. A cheliped is a specialized jointed appendage within the arthropod body plan.
Carpus (arthropod anatomy): The wrist-like segment between the propodus and merus in many arthropod limbs. This segment links the cheliped's proximal limb to the claw-bearing hand.
Crustacean defense: Behaviors and structures crustaceans use to deter predators and avoid injury. A cheliped's grasp or threat display can discourage an approaching predator.
Maxilliped: A modified thoracic appendage in crustaceans that assists with feeding. Maxillipeds serve near the mouth, unlike the typically larger, more posterior chelipeds.
Crustacean: An arthropod group that includes crabs, lobsters, shrimp, and their relatives. Chelipeds are found across several crustacean lineages, not only among crabs.
Propodus: The limb segment that often forms the palm of a crustacean claw. Its distal edge bears the fixed finger, while the movable finger hinges against it.