Vertebriceras
Species
Vertebriceras canadense (Whiteaves, 1903)
Characterized by very coarse ribbing.
Occurrence: Redwater Shale Member in Wyoming; Swift Formation in Montana. Also in the Fernie Group near Lillooet, British Columbia.
Formerly called Cardioceras (Subvertebriceras) canadense
Reference: Imlay, 1982
Vertebriceras canadense
Photograph from Imlay, 1982
Vertebriceras stantoni Reeside, 1919
Is compressed to moderately stout, with wide umbilicus, rounded umbilical shoulder, sharp ribbing most pronounced near middle of flanks, with largest whorl having pronounced chevrons and serrated keel.
Occurrence: Redwater Shale Member in Wyoming and South Dakota; Stump Formation in northeast Utah; Swift Formation in Montana
Formerly called Cardioceras (Vertebriceras) stantoni
Reference: Imlay, 1982
Vertebriceras stantoni
Photograph from Imlay, 1982
Vertebriceras haresi Reeside, 1919
Depressed quadrate outer whorls, those whorls reaching their greatest width ventrally, and by their ribs forming acute chevrons on the venter.
Occurrence: Redwater Shale Member in Wyoming; possibly Swift Formation in Montana
Formerly called Cardioceras (Vertebriceras) haresi
Reference: Imlay, 1982
Vertebriceras haresi
Photograph from Imlay, 1982
Vertebriceras obtusum Reeside, 1919
Distinguished from V. haresi by having lower and broader ventral ribs, a lower, less distinct keel, and ovate instead of quadrate whole section, and lacking lateral tubercles.
Occurrence: Redwater Shale Member in Wyoming; Stump Formation in northeast Utah.
Formerly called Cardioceras (Sagitticeras) obtusum
Reference: Imlay, 1982
Vertebriceras obtusum
Photograph from Imlay, 1982
