Akam, M., and Averof, M. 1993. HOM/Hox genes of Artemia: implications for the origin of insect and crustacean body plans. Current Biology, 3:73-78.
Averof, M., and Akam, M. 1995. Insect-crustacean relationships: insights from comparative developmental and molecular studies. Philosophical Transactions of the Royal Society of London, B, 347:293-303.
Ax, P. 1985. Stem species and the stem lineage concept. Cladistics, 1:279-287.
Ballard, J.W.O., Olsen, G.J., Faith, D.P., Odgers, W.A., Rowell, D.M., and Atkinson, P.W. 1992. Evidence from 12S ribosomal RNA sequences that onychophorans are modified arthropods. Science, 258:1345-1348.
Briggs, D.E.G. 1990. Early arthropods: Dampening the Cambrian radiation, pp. 1-17. In D. Mikulic (ed.), Short Courses in Paleontology. Volume 3. Arthropod Paleobiology. Paleontological Society, Knoxville.
Briggs, D.E.G., Fortey, R.A., and Wills, M.A. 1992. Morphological disparity in the Cambrian. Science, 256:1670-1673.
Chen, J.-Y., Ramsköld, L., and Zhou, G.-Q. 1994. Evidence for monophyly and arthropod affinity of Cambrian giant predators. Science, 264:1305-1308.
Chen, J.-Y., Edgecombe, G.D., and Ramsköld, L. 1997. Morphological and ecological disparity in naraoiids (Arthropoda) from the Early Cambrian Chengjiang fauna, China. Records of the Australian Museum, 49:1-24.
Chen, J.-Y., Zhou, G.-Q., and Ramsköld, L. 1995. The Cambrian lobopodian Microdictyon sinicum. Bulletin of the National Museum of Natural Science (Taichung, Taiwan), 5:1-93.
Chen, J.-Y., Edgecombe, G.D., Ramsköld, and Zhou, G.-Q. 1995. Head segmentation in Early Cambrian Fuxianhuia: implications for arthropod evolution. Science, 268:1339-1343.
Dohle, W. 1998. Myriapod-insect relationships as opposed to an insect-crustacean sister group relationship, pp. 305-315. In Fortey, R.A. and Thomas, R.H. (eds), Arthropod Relationships. Systematics Association Special Volume Series 55. Chapman and Hall, London.
Dunlop, J.A., and Selden, P.A. 1998. The early history and phylogeny of the chelicerates, pp. 221-235. In Fortey, R.A. and Thomas, R.H. (eds), Arthropod Relationships. Systematics Association Special Volume Series 55. Chapman and Hall, London.
Friedrich, M., and Tautz, D. 1995. rDNA phylogeny of the major extant arthropod classes and the evolution of the Myriapoda. Nature, 376:165-167.
Gould, S.J. 1989. Wonderful Life. The Burgess Shale and the Nature of History. W.W. Norton and Company, New York and London.
Hou, X.-G. and Bergström, J. 1997. Arthropods of the Lower Cambrian Chengjiang fauna, southwest China. Fossils and Strata, 45:1-116.
Kraus, O. 1998. Phylogenetic relationships between higher taxa of tracheate arthropods, pp. 295-303. In Fortey, R.A. and Thomas, R.H. (eds), Arthropod Relationships. Systematics Association Special Volume Series 55. Chapman and Hall, London.
Manton, S.M. 1977. The Arthropoda: Habits, Functional Morphology, and Evolution. Claredon Press, Oxford.
Müller, K.J., and Walossek, D. 1985. Skaracarida: A new order of Crustacea from the Upper Cambrian of Västergötland, Sweden. Fossils and Strata, 17:1-65.
Müller, K.J., and Walossek, D. 1987. Morphology, ontogeny, and life-habit of Agnostus pisiformis from the Upper Cambrian of Sweden. Fossils and Strata, 19:1-124.
Müller, K.J., and Walossek, D. 1988. External morphology and larval development of the Upper Cambrian maxillopod Bredocaris admirabilis. Fossils and Strata, 23:1-70.
Ramsköld, L. 1992a. The second leg row of Hallucigenia discovered. Lethaia, 25:221-224.
Ramsköld, L. 1992b. Homologies in Cambrian Onychophora. Lethaia, 25:443-460.
Ramsköld, L., and Edgecombe, G. D. 1996. Trilobite appendage structure - Eoredlichia reconsidered. Alcheringa, 20:269-276.
Ramsköld, L., and Hou, X-G. 1991. New Early Cambrian animal and onychophoran affinites of enigmatic metazoans. Nature, 351:225-228.
Ramsköld, L., Chen, J.-Y., Edgecombe, G. D., and Zhou, G.-Q. 1996. Preservational folds simulating tergite junctions in tegopeltid and naraoiid arthropods. Lethaia, 29:15-20.
Ramsköld, L., Chen, J.-Y., Edgecombe, G. D., and Zhou, G.-Q. 1997. Cindarella and the arachnate clade Xandarellida (Arthropoda, Early Cambrian) from China. Transactions of the Royal Society of Edinburgh: Earth Sciences, 88:19-38.
Schram, F.R. 1978. Arthropods: A convergent phenomenon. Fieldiana, Geology, 39:61-108.
Schultz, J.W. 1990. Evolutionary morphology and phylogeny of Arachnida. Cladistics, 6:1-38.
Turbeville, J.M., Pfeifer, D.M., Field, K.G., and Raff, R.A. 1991. The phylogenetic status of the arthropods, as inferred from 18S rRNA sequences. Molecular Biology and Evolution, 8:669-702.
Walossek, D. 1993. The Upper Cambrian Rehbachiella and the phylogeny of Branchiopoda and Crustacea. Fossils and Strata, 32:1-202.
Wheeler, W.C., Cartwright, P., and Hayashi, C.Y. 1993. Arthropod phylogeny: A combined approach. Cladistics, 9:1-39.
Wills, M.A., Briggs, D.E.G., and Fortey, R.A. 1994. Disparity as an evolutionary index: A comparison of Cambrian and Recent arthropods. Paleobiology, 20:93-130.
Wills, M.A., Briggs, D.E.G., Fortey, R.A., and Wilkinson, M. 1995. The significance of fossils in understanding arthropod evolution. Verhandlungen der deutschen zoologischen Gesellschaft, 88:203-215.
Wray, G.A., Levinton, J.S., and Shapiro, L.H. 1996. Molecular evidence for deep Precambrian divergences among metazoan phyla. Science, 274:568-573.
