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Excerpt from Systematic Revision of the Olenelloidea (Trilobita, Cambrian) The present study was motivated by the need to revise relationships within the Olenel loidea, and place them within a rigorous framework. Past studies of the olenellids, such as Palmer and Repina have relied on circular and/ or subjective criteria, placing them on quite dubious phylogenetic grounds. This has also had a negative impact on strati graphic studies. For example, in some papers stratigraphic units were defined by the in ferred phylogenetic position of the contained olenellid taxa, and this stratigraphic informa tion was further used to determine evolutionary relationships. Moreover, what had originally been treated as the genus Olenellus see Fritz 1992; Palmer and Repina 1993) actually represents a polyphyletic assemblage of taxa. Therefore, the eponymous Olenellus stratigraphic zone, an important division within the Early Cambrian, may be correlated on the basis of spurious criteria. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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