Palaeontology
Smith A. B. (1985) Cambrian eleutherozoan echinoderms and the early diversification of edrioasteroids. Palaeontology, 52, 1149–68.
Palaeontology
Smith A. B., Reich M. (2013) Tracing the evolution of holothurian body plan through stem-group fossils. Biological Journal of the Linnean Society, 109, 670–81.
Biological Journal of the Linnean Society
Smith A. B., Savill J. J. (2001) Bromidechinus, a new Ordovician echinozoan (Echinodermata), and its bearing on the early history of echinoids. Transactions of the Royal Society of Edinburgh: Earth Sciences, 92, 137–47.
Bromidechinus
Transactions of the Royal Society of Edinburgh: Earth Sciences
Smith A. B., Zamora S. (2013) Cambrian spiral-plated echinoderms from Gondwana reveal the earliest pentaradial body plan. Proceedings of the Royal Society B: Biological Sciences, 280, 20131197. DOI: 10.1098/rspb.2013.1197.
Proceedings of the Royal Society B: Biological Sciences
Sollas W. J. (1899) Fossils in the University Museum, Oxford: I. On Silurian Echinoidea and Ophiuroidea. The Quarterly Journal of the Geological Society of London, 55, 692–715.
The Quarterly Journal of the Geological Society of London
Spencer W. K. (1951) Early Palaeozoic starfish. Proceedings of the Royal Society of London, Series B: Biological Sciences, 235, 87–129.
Proceedings of the Royal Society of London, Series B: Biological Sciences
Sutton M. D. et al. (2005) A starfish with three-dimensionally preserved soft parts from the Silurian of England. Proceedings of the Royal Society B: Biological Sciences, 272, 1001–6.
. et al.
Proceedings of the Royal Society B: Biological Sciences
Underwood C. J. (1993) The position of the graptolites within Lower Palaeozoic planktic ecosystems. Lethaia, 26, 189–202.
Lethaia
Urbanek A. (1986) The enigma of graptolite ancestry: Lessons from a phylogenetic debate. Problematic Fossil Taxa. Eds. A. Hoffman, M. H. Nitecki. New York: Oxford University Press; Oxford: Clarendon Press. P. 184–226.