source of synonymyKröger, B.; Landing, E. (2007). The earliest Ordovician cephalopods of eastern Laurentia — Ellesmerocerids of the Hill Formation, eastern New York. <em>Journal of Paleontology.</em> 81(5): 841-857., available online athttps://doi.org/10.1666/pleo05-166.1[details] Available for editors
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