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Synziphosurina

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Synziphosurines are a paraphyletic group of xiphosurid ancestors (within the class Xiphosura) from the Silurian to the Carboniferous periods.[1] The earliest accepted synziphosurines are Venustulus waukeshaensis, found in Early Silurian (Late Llandovery) deposits in Wisconsin, and Bembicosoma pomphicus, from the same period, known from deposits in Scotland.[1]

References

  1. ^ a b Rudkin, David M.; Young, Graham A.; Nowlan, Godfrey S. (January 2008). "The Oldest Horseshoe Crab: A New Xiphosurid From Late Ordovician Konservat-Lagerstätten Deposits, Manitoba, Canada" (PDF). Palaeontology. 51 (1): 1–9. doi:10.1111/j.1475-4983.2007.00746.x.