Abstract
Many aspects of skeletal morphological research in bryozoans have involved destructive methods, such as thin sectioning of Palaeozoic fossils or removal of basal walls to view internal structures in cheilostomes. Two relatively new technologies allow non-destructive visualisation of internal zooidal skeletal structures. Tomography is shown to be very effective for cheilostome zooid cavities as it allows resolution down to 1 μm, which can resolve features such as the morphological evidence of origins of frontal shields in ascophoran cheilostomes. It also generates a three-dimensional reconstruction of the whole structure, which can resolve complex internal structures like those of Siphonicytara, or how multilaminar colonies develop the communication between layers. The Synchrotron is best suited to image the internal structures of Palaeozoic bryozoans that have mineral-filled zooidal cavities, as it can better resolve differences in composition.
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Acknowledgments
The tomography image was taken in the Department of Physics, La Trobe University, Melbourne, with the assistance of Drs. Benedicta Arhatari and Peter Kappen. Thanks to Tim Senden, Australian National University for assistance with further tomography. Chris Hall (Imaging and Medical Therapy (IMT) beamline at the Australian Synchrotron) for advice on analysing Palaeozoic Bryozoa. Tim Holland (Museum Victoria), Ajay Limaye (ANU), Drew Whitehouse (ANU) for assistance in processing that data. Thanks to Thomas Schwaha and Paul Taylor for greatly improving the article.
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Schmidt, R. (2013). High Resolution Non-destructive Imaging Techniques for Internal Fine Structure of Bryozoan Skeletons. In: Ernst, A., Schäfer, P., Scholz, J. (eds) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16411-8_21
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