Publisher's Synopsis
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.
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