sentences:  Aulatornoceratinae and Falcitornoceratinae were established by Becker in 1993; Aulatornoceratinae based on "Aulatornoceras", named by Schindewolf in 1922; Falcitornoceratinae on "Falcitornoceras", named by House and Price in 1985.The Tornoceratinae form the root stock of the tornoceratids and are derived from Anarcestida.Tornoceratinae in turn gave rise to Aulatornoceratinae and Falcitornoceratinae.