01418nas a2200181   4500008004100000245013400041210006900175300001200244490000700256520083100263653001501094653001601109653001701125653001901142100002201161700000501183856004801188       2004                        eng d00aSummary of a Revision of New York State Ordivician Eurypterids: Implications for Eurypterid Paleoecology, Diversity and Evolution0 aSummary of a Revision of New York State Ordivician Eurypterids I  a235-2420 v943 a<p>The record of Ordovician Eurypterida from New York State, USA, is shown to be largely false. Twenty-nine species in 17 genera are here recognised as pseudofossils, reducing by more than 75% the total number of named Ordovician eurypterid taxa. Consequently, 10 families now have their first occurrence either later in the Ordovician or in the Early Silurian. The implications for eurypterid palaeoecology, diversity and evolution are not as straightforward as would be expected from such a drastic taxonomic revision. All Ordovician eurypterids are now known to occur in shallow-water, near-shore shales or fine-grained carbonates. Diversity measures indicate that the end-Ordovician extinction event appears to have had less effect on eurypterids than previously known, and their turnover is level in the Ordovician.</p>
10aArthropoda10aChelicerata10adistribution10aEarly Silurian1 aTollerton, V., P.1 a  uhttp://dx.doi.org/10.1017/S026359330000064X