High Quality Content by WIKIPEDIA articles! Xiphosura is an order of marine chelicerates which includes a large number of extinct lineages and only four recent species in the family Limulidae, which include the horseshoe crabs. The group has hardly changed in millions of years; the modern horseshoe crabs look almost identical to prehistoric genera such as the Jurassic Mesolimulus, and are considered to be living fossils. Xiphosura are traditionally placed in the class Merostomata, although this term was originally intended to encompass also the eurypterids, whence it denoted what is now known to be an unnatural (paraphyletic) group.

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