xiphosura

Noun
  1. Horseshoe crabs and extinct forms (synset 101790042)
    is a type of: animal order - the order of animals
    member holonym: family limulidae, limulidae - horseshoe crabs
    belongs to: class merostomata, merostomata - used in some classifications; includes the orders Xiphosura and Eurypterida
    same as: order xiphosura

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