KnowraXiphosuraLinked fromLinked fromThe 2 pages that link to Xiphosura, each with the reason it gives.All 2Broader topic 1Narrower topic 1ChelicerataBroader topic: Horseshoe crabs represent a distinctive marine branch outside Arachnida.Horseshoe crabNarrower topic: This is the larger taxonomic group to which horseshoe crabs belong.