Definition of Chelicerata in English:

Chelicerata

plural noun

Zoology
  • A large group of arthropods that comprises the arachnids, sea spiders, and horseshoe crabs. They lack antennae, but possess a pair of chelicerae, a pair of pedipalps, and (typically) four pairs of legs.

    • ‘Arthropods have traditionally been divided into four classes: Trilobita, Chelicerata, Crustacea, and Uniramia.’
    • ‘The Chelicerata are distinguished by the absence of antennae, and the presence of fangs or chelicerae (the first pair of appendages) rather than mandibles.’
    • ‘Generations of morphologists have been unable to determine the branching order of Chelicerata, Myriapoda, Crustacea and Insecta.’
    • ‘One of these pairs is expected to be the homologue to the chelicerae of the Chelicerata.’
    • ‘Two of these include the first reported rearrangements of arthropod protein-coding genes outside of the Chelicerata.’

Origin

Modern Latin (plural), from Greek khēlē claw + keras horn.

Pronunciation:

Chelicerata

/kəˌlɪsəˈreɪtə/