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A chela () – also called a claw, nipper, or pincer – is a pincer-shaped organ at the end of certain limbs of some arthropods. The name comes from Ancient Greek χηλή, through Neo-Latin chela. The plural form is chelae. Legs bearing a chela are called chelipeds. Another name is claw because most chelae are curved and have a sharp point like a claw.
Chelae can be present at the tips of arthropod legs as well as their pedipalps. Chelae are distinct from spider chelicerae in that they do not contain venomous glands and cannot distribute venom.
Uses
Chelae have a wide variety of uses, but most commonly they are used for handling their prey and for defense. These uses are often reflected in the morphology of the chelae. For instance, some species, such as the members of the families Ocypodidae and Alpheidae show asymmetry between their paired claws. Possessing one enlarged chela used for defensive and courtship purposes and a smaller chela for shearing and feeding. For some species, this asymmetry between chelae may be a sexually dimorphic trait. whereas in others, like many species of scorpions, it is not. An example of specialization of these asymmetrical chelae can be seen in the Alpheus heterochaelis, the bigclaw snapping shrimp. The enlarged snapping claws of these shrimp are capable of snapping shut with such force to shoot a jet of water and create a loud popping noise, which they use to deter predators and other members of their species.
In scorpion species, the chelae are often used to grab hold of prey and then further subdue them by injecting them with the venom from their stingers, although some species rely solely on the chelae to subdue their prey. Scorpions also use their chelae for defense by using them to shield and protect their bodies. For scorpions, the chelae are formed at the end of the pedipalps and covered in sensory hairs that they use in a similar manner to insect antennae.
Further uses of chelae include digging, burrowing, and climbing. Chelae also play an important role in many species mating rituals, such as to communicate and attract prospective mates, wherein species with asymmetrical chelae use their enlarged chela as a display to attract mates. Chelae are also used in the act of mating, where the male species will often use them to hold onto the female during the act.
See also
Pincer (tool)
References
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Chelae - Wikipedia
Chelae are distinct from spider chelicerae in that they do not contain venomous glands and cannot distribute venom. Chelae have a wide variety of uses, but most commonly they are used for handling their prey and for defense. These uses …
Chela Definition & Meaning - Merriam-Webster
The meaning of CHELA is a pincerlike organ or claw borne by a limb of a crustacean or arachnid.
chela, chelae, chelate, cheliform, cheliped - BugGuide.Net
chela noun, plural chelae - the terminal portion of an arthropod appendage (usually a leg, but may refer to a mouthpart) with a movable lateral claw, like that of a crab. chelate adjective - possessing a movable lateral claw like that of a crab. cheliform adjective - pincer-shaped. Dollar, 2001.
Chela | zoology | Britannica
In crabs there is a single obvious pair of chelae, but in some of the prawns there may be up to three pairs of less conspicuous pincers. The decapod abdomen normally bears six pairs of biramous appendages, which are used in swimming in many…
Chela - Wikipedia
Look up chela in Wiktionary, the free dictionary.
The exoskeleton of scorpions’ pincers: Structure and
01 Agu 2019 · The scorpion chela is a multifunctional part of the body (e.g. attack/defense, mating and protection from the environment) that involves the development of various stresses in the cuticle. How these stresses in the chela cuticle are managed by …
What does chelae mean? - Definitions.net
chelae. A chela – also called a claw, nipper, or pincer – is a pincer-like organ at the end of certain limbs of some arthropods. The name comes from Ancient Greek χηλή, through New Latin chela. The plural form is chelae. Legs bearing a chela are called chelipeds.
A Mighty Claw: Pinching Force of the Coconut Crab, the Largest …
23 Nov 2016 · Most decapod crustaceans possess well-developed chelae, which are typically used to capture, manipulate, and process prey (e.g., crush), as well as for defense and aggressive intraspecific interactions and displays .
Chelae
From New Latin, derived from Greek 'khele', meaning 'claw' or 'hoof'. The chelae of a scorpion are often used to grasp prey before delivering a venomous sting. Chelae vary widely in size and shape among different species and are often adapted to their specific ecological roles.
Chelae | definition of chelae by Medical dictionary
Meaning of chelae medical term. What does chelae mean?