Chelicerata
plural noun
Che·lic·er·ata kə-ˌli-sə-ˈrä-tə 
-ˈrā-tə
: a subphylum or other division of the phylum Arthropoda comprising forms having chelicerae and lacking antennae and including the horseshoe crabs and eurypterids, spiders, scorpions, and sea spiders
A fossil eurypterid, representing the Chelicerata.
Stephen Jay Gould, Wonderful Life, 1989
see arachnida , merostomata , pycnogonida Stephen Jay Gould, Wonderful Life, 1989
Word History
Etymology
borrowed from New Latin, Latinization (with New Latin -ata -ata) of French chélicérés, from chélicère chelicera + -és, plural of -é, adjective and participle ending going back to Latin -ātus -ate entry 3
First Known Use
1919, in the meaning defined above