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PROTISTS 233

tively late in the geological record. Is zoa. International Journal of Systematic and Evolu-
there any evidence for a Paleozoic tionary Microbiology 52, 297–354.
nannoplankton? Corsetti, F.A., Olcott, A.N. & Bakermans, C. 2006. The
5 The identity of the chitinozoans may have biotic response to Neoproterozoic snowball Earth.
been solved but how should these fossils Palaeogeography, Palaeoclimatology, Palaeoecology
be classifi ed? 232, 114–30.
De Wever, P., Dumitrica, P., Caulet, J.P., Nigrini, C. &
Caridroit, M. 2001. Radiolarians in the Sedimentary
Record. Gordon and Breach Science Publishers, the
Further reading Netherlands.
Haeckel, E. 1862. Die Radiolarien (Rhizopoda Radi-
Armstrong, H.A. & Brasier, M.D. 2005. Microfossils, aria). Eine Monographie. Reimer, Berlin.
2nd edn. Blackwell Publishing, Oxford, UK. Haeckel, E. 1904. Kunstformen der Natur. Verlag des
Bignot, G. 1985. Elements of Micropalaeontology. Bibliographischen Institut, Leipzig.
Graham and Trotman, London. (Useful overview of Henriksen, K., Young, J.R., Bown, P.R. & Stipp, S.L.S.
all the main microfossil groups.) 2004. Coccolith biomineralisation studied with
De Wever, P., Dumitrica, P., Caulet, J.P., Nigrini, C. & atomic force microscopy. Palaeontology 47, 725–
Caridroit, M. 2001. Radiolarians in the Sedimentary 43.
Record. Gordon and Breach Science Publishers, the Jacob, J., Paris, F., Monod, O., Miller, M.A., Tang, P.,
Netherlands. (Key reference on radiolarian George, S.C. & Bény, J.-M. 2007. New insights into
paleontology.) the chemical composition of chitinozoans. Organic
Haeckel, E. 1862. Die Radiolarien (Rhizopoda Radi- Geochemistry 38, 1782–8.
aria). Eine Monographie. Reimer, Berlin. (Classic Keeling, P.J., Burger, G., Durnford, D.G. et al. 2005.
reference on Radiolaria, beautifully illustrated.) The tree of eukaryotes. Trends in Ecology and Evo-
Jenkins, D.G. & Murray, J.W. 1989. Stratigraphical lution 20, 670–6.
Atlas of Fossil Foraminifera, 2nd edn. British Paris, F. & Nolvak, J. 1999. Biological interpretation
Micropaleontology Association and Ellis Horwood and palaeobiodiversity of a cryptic fossil group: the
Ltd, London. (Well-illustrated account of the “chitinozoan animal”. Geobios 32, 315–24.
foraminiferans.) Servais, T., Lehnert, O., Li, J., Mullins, G.L., Munnecke,
Lipps, J.H. (ed.) 1993. Fossil Prokaryotes and Protists. A., Nützel, A. & Vecoli, M. 2008. The Ordovician
Blackwell Scientifi c Publications, Oxford, UK. (Mul- biodiversification: revolution in the oceanic trophic

tiauthor compilation of the prokaryote and protist realm. Lethaia 41, 99–110.
microfossil groups.) Tyszka, J. 2006. Morphospace of foraminiferal shells:
results from the moving reference model. Lethaia 39,
1–12.
Vecoli, M., Lehnert, O. & Servais, T. 2005. The role of
References
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Cavalier-Smith, T. 2002. The phagotrophic origin of
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