1Fisher DC.The Xiphosurida:Archetypes of bradytely? In:Eldredge N,Stanley SM,eds.Living Fossils.Berlin:Springer,1984:106-212.
2Walls EA,Berkson J,Smith SA.The horseshoe crab,Limulus polyphemus:200 million years of existence,100 years of study.Reviews in Fisheries Science,2002,10:39-73.
3Barthel KW,Swinburne NHM,Conway Morris S.Solnhofen,A Study in Mesozoic Palaeontology.Cambridge (UK):Cambridge University Press,1990,138-142.
4Anderson LI,Selden,PA.Opisthosomal fusion and phylogeny of Palaeozoic Xiphosura.Lethaia,1997,30:19-31.
5Babcock LE,Merriam DF,West RR.Paleolimulus:an early limuline (Xiphosurida),from Pennsylvanian-Permian Lagerstatten of Kansas and taphonomic comparison with modern Limulus.Lethaia,2000,33:129-141.
6Allen JG,Feldmann RM.Panduralimulus babcocki n.yen.and sp.,a new limulacean horseshoe crab from the Permian of Texas.Journal of Paleontology,2005,79:594-600.
7Dunlop JA,Selden PA.The early history and phylogeny of the chelicerates.In:Fortey RA,Thomas RH,eds.Arthropod Relationships.Systematics Association Special Volume,55.London:Chapman and Hall,1998,221-235.
8David MR,Grahama Y,Godfrey SN,et al.The oldest horseshoe crab:A new Xiphosurid from Late Ordovician KonservatLagerstatten depositits,Manitoba,Canada.Palaeontology,2008,51:1-9.
9Pickett JW.A new freshwater limuloid from the Middle Triassic of New South Wales.Palaeontology,1984,27:609-621.
10Riek EF.A new Xiphosuran from the Triassic sediments at Brookvale,New South Wales.Records of the Australian Museum,1955,23:281-282.
