List of contributors. Preface. 1. Bodyplans, phyla and arthropods; J.W. Valentine, H. Hamilton. 2. The phylogenetic position of the Arthropoda; C. Nielsen. 3. A defence of arthropod polyphyly; G. Fryer. 4. Hox genes and annelid-arthropod relationships; M.H. Dick. 5. Arthropod and annelid relationships re-examined; D.J. Eernisse. 6. Evolutionary correlates of arthropod tagmosis: scrambled legs; M.A. Wills, D.E.G. Briggs, R.A. Fortey. 7. Theories, patterns, and reality: game plan for arthropod phylogeny; M.J. Emerson, F.R. Schram. 8. Sampling, groundplans, total evidence and the systematics of arthropods; W.C. Wheeler. 9. Arthropod phylogeny: taxonomic congruence, total evidence and conditional combination approaches to morphological and molecular data sets; J. Zrzavu, V. Hypsa, M. Vlaskova. 10. The place of tardigrades in arthropod evolution; R.A. Dewel, W.C. Dewel. 11. Stem group arthropods from the Lower Cambrian Sirius Passet fauna of North Greenland; G.E. Budd. 12. Cambrian 'Orsten'-type arthropods and the phylogeny of Crustacea; D. Walossek, K.J. Muller. 13. Comparative limb morphology in major crustacean groups: the coxa-basis joint in postmandibular limbs; G. Boxshall. 14. Crustacean phylogeny inferred from 18S rDNA; T. Spears, L.G. Abele. 15. A phylogeny of recent and fossil Crustacea derived from morphological characters; M.A. Wills. 16. The fossil record and evolution of the Myriapoda; W.A. Shear. 17. The early history and phylogeny of the chelicerates; J.A. Dunlop, P.A. Selden. 18. Problem of the basal dichotomy of the winged insects; A.P. Rasnitsyn. 19. Arthropod phylogeny and 'basal' morphological structures; J. Kukalova-Peck. 20. Advances and problems in insect phylogeny; R. Willmann. 21. The groundplan and basal diversification of the hexapods; N.P. Kristensen. 22. Phylogenetic relationships between higher taxa of tracheate arthropods; O. Kraus. 23. Myriapod--insect relationships as opposed to an insect--crustacean sister group relationship; W. Dohle. 24. Cleavage, germ band formation and head segmentation: the ground pattern of the Euarthropoda; G. Scholtz. 25. Homology and parallelism in arthropod sensory processing; D.-E. Nilsson, D. Osorio. 26. The organization and development of the arthropod ventral nerve cord: insights into arthropod relationships; P.M. Whitington, J.P. Bacon.