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Journal of Paleontology

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A NEW EURYPTERID (CHELICERATA) FROM THE UPPER ORDOVICIAN OF MANITOULIN ISLAND, ONTARIO, CANADA

¹ Department of Earth Sciences, The University of Western Ontario, London, Ontario N6A 5B7, Canada <castott{at}uwo.ca>
² Department of Geology and Geophysics, Yale University, PO Box 208109, New Haven, Connecticut 06520-8109, <erik.tetlie{at}yale.edu>
³ Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, United Kingdom
⁴ Geological Survey of Canada, 3303-33rd Street N.W., Calgary, Alberta T2L 2A7, Canada
⁵ School of Dentistry, Faculty of Medicine & Dentistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
⁶ Faculty of Science, Office of the Dean, The University of Western Ontario, London, Ontario N6A 5B7, Canada

A new genus and species of eurypterid (Eurypterida: Chelicerata) is described as Orcanopterus manitoulinensis from the Upper Ordovician Kagawong Submember (Upper Member) of the Georgian Bay Formation, Manitoulin Island, Ontario, Canada. The material comprises several partial specimens in addition to disarticulated carapaces, appendages, metastomas, opisthosomal segments, and telsons. Associated fossils include rare bryozoans, a conularid, ostracodes, and conodonts. A restricted marine lagoon, or very shallow subtidal to intertidal environment is inferred. This assemblage, perhaps representing an accumulation of molted exuviae, was apparently preserved as the result of rapid burial by carbonate muds and silts during a storm event. O. manitoulinensis shares a number of traits with both the Hughmilleriidae and the Carcinosomatidae. Diagnostic features include curved preabdominal segments, a petaloid A metastoma with deep anterior emargination, spiniferous appendages of Carcinosoma type, paddle with enlarged, symmetrical podomere 9, and a xiphous telson. It is only the fourth (the first Canadian) well-documented Ordovician eurypterid genus, and provides the oldest reliable record of the Hughmillerioidea to date.

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