Abstract

Christioceras trifurcatum n. sp. is one of about 15 species of ammonoids recovered from Lower or basal Middle Pennsylvanian moundlike carbonate reefs at Hare Fiord, Ellesmere Island, Northwest Territories. Christioceras n. gen. is assigned to the family Schistoceratidae Schmidt, Christioceratinae n. subfam. The new genus is considered to be an end member in a branch of the rapidly evolving schistoceratid stock.

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