Rudkin, D.M.; Young, G.A.; Nowlan, G.S. (Januar 2008). »The Oldest Horseshoe Crab: a New Xiphosurid from Late Ordovician Konservat-Lagerstätten Deposits, Manitoba, Canada«. Palaeontology. Zv. 51, št. 1. str. 1–9. doi:10.1111/j.1475-4983.2007.00746.x.
Wills, M.A. (2001). »How good is the fossil record of arthropods? An assessment using the stratigraphic congruence of cladograms«. Geological Journal. Zv. 36, št. 3–4. str. 187–210. doi:10.1002/gj.882.
Jenner, R.A. (2006). »Challenging received wisdoms: Some contributions of the new microscopy to the new animal phylogeny«. Integrative and Comparative Biology. Zv. 46, št. 2. str. 93–103. doi:10.1093/icb/icj014.
Weygoldt, P. (Februar 1998). »Evolution and systematics of the Chelicerata«. Experimental and Applied Acarology. Zv. 22, št. 2. str. 63–79. doi:10.1023/A:1006037525704.
