The phylogeny and systematics of Xiphosura - PMC - National …
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7720731/
WebDec 4, 2020 · Xiphosurans, colloquially known as horseshoe crabs, are a clade of aquatic chelicerates represented by four extant species ( Lamsdell, in press) with an evolutionary history stretching back 470 million years to the Ordovician ( Rudkin, Young & Nowlan, 2008; Van Roy et al., 2010 ).
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