| Noun | 1. | superclass Chelicerata - spiders; scorpions; horseshoe crabs Arthropoda, phylum Arthropoda - jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes Arachnida, class Arachnida - a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings order Pycnogonida, Pycnogonida - sea spiders class Merostomata, Merostomata - used in some classifications; includes the orders Xiphosura and Eurypterida class - (biology) a taxonomic group containing one or more orders |