Baltoceras is a member of the Ellesmerocerida, included in the family, Baltoceratidae. The shell of Baltoceras is slender with a subcircular cross section, straight transverse sutures, and a large siphuncle in contact with the venter. Septal necks are short but not vestigial; connecting rings are thick; endosiphonal organic deposits are unknown. Baltoceras ranges in age from Whiterock to Chazy (Middle Ordovician). The few species known are from the upper of Nevada, the Day Point Limestone of New York, and the “Orthoceras limestone” of the Baltic region of Europe.
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