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).
Memoir 12; New Mexico Bureau of Mines and Mineral Resources, Socorro, NM