Merostomata

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{{Taxobox | color = pink | name = Merostomata | regnum = Animalia | phylum = Arthropoda | subphylum = Chelicerata | classis = Merostomata | subdivision_ranks = Orders | subdivision =

}}

Merostomata is a class of marine Chelicerata which includes horseshoe crabs and eurypterids. It includes only four living species but dozens of fossil species mainly from the Paleozoic. The class Merostomata is slowly being abandoned in favour of splitting it into two classes, Xiphosura and Eurypterida. This is because Merostomata is thought to be paraphyletic, with the Eurypterida more closely related to the Arachnida, forming the group Cryptopneustida.

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Reference

http://www.earthlife.net/chelicerata/merostomata.html

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