Asterolepis chadwicki n. sp., from the lower part of the Upper Devonian continental Katsberg Formation, at Parksville, Sullivan County, N. Y., is the first record of this genus of antiarch fish in North America. Six plates of posterior trunk armor of one individual are described. This occurrence in the middle of the Senecan Series (equivalent to European Middle Frasnian) considerably extends the stratigraphic and geographic range of a genus characteristic of the upper Middle Devonian in northern Europe and East Greenland.

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