Ceratopsis
Ceratopsis chambersi
Photo courtesy of Jack Kallmeyer
Specimen is 1 mm long
Ceratopsis intermedia
Photo from Warshauer and Berdan, 1982
Scale bar is 1 mm
Distinguished from Tetradella by the remarkable process that arises from dorsal extremity of the posterior ridge. This may be straight and hornlike with one of the edges toothed, or expanded somewhat mushroomlike (Bassler and Kellett, 1934).
Species
Ceratopsis asymmetrica Warshauer and Berdan, 1982
Occurrence: Clays Ferry
Reference: Warshauer and Berdan, 1982
Ceratopsis chambersi (Miller, 1874)
Occurrence: Clays Ferry, Fulton, Economy, Southgate, McMicken
Reference: Warshauer and Berdan, 1982; Bassler and Kellett, 1934
Ceratopsis fimbriata Warshauer and Berdan, 1982
Occurrence: Clays Ferry
Reference: Warshauer and Berdan, 1982
Ceratopsis intermedia Ulrich, 1894
Occurrence: Clays Ferry, Fulton
Reference: Warshauer and Berdan, 1982; Bassler and Kellett, 1934
Ceratopsis oculifera (Hall, 1871)
Occurrence: Corryville
Reference: Warshauer and Berdan, 1982; Smith and Tillman, 1996; Bassler and Kellett, 1934
Ceratopsis robusta (Ulrich, 1894)
Occurrence: Waynesville, Liberty, Whitewater, Elkhorn
Reference: Warshauer and Berdan, 1982; Bassler and Kellett, 1934
