Tetradella
Tetradella
Drawing from Bassler and Kellett, 1934
Valves marked by four or less curved vertical ridges ventrally united; one or both of the inner ridges sometimes duplex (Bassler and Kellett, 1934).
Species
Tetradella lunatifera (Ulrich, 1889)
Occurrence: Waynesville, Liberty, Whitewater, Elkhorn
Reference: Dalvé, 1948; Bassler and Kellett, 1934
Originally named Strepula lunatifera
Tetradella quadrilirata (Hall and Whitfield, 1875)
Occurrence: Waynesville, Liberty, Whitewater, Elkhorn
Reference: Smith and Tillman, 1996; Bassler and Kellett, 1934
Originally named Beyrichia quadrilirata, also called Strepula quadrilirata
Tetradella simplex Ulrich, 1889
Occurrence: Waynesville, Liberty, Whitewater, Elkhorn
Reference: Dalvé, 1948; Bassler and Kellett, 1934
