sentences:  Tornoceratoid genera are divided among five families, Tornoceratidae, Parodoceratidae, Posttornoceratidae, Pseudoclymediidae, and Kirsoceratidae, some of which have been recently established.Tornoceratidae, essentially the Tornoceratidae of the Treatise, Part L, 1957, included in the Cheilocerataceae is split as a result of new discoveries into three subfamilies, the Tornnoceratinae, Aulatornoceratinae and Falcitornoceratinae, of which the Tornoceratinae is the oldest.Parodoceratidae, proposed by Petter in 1959 is based on the genus "Parodoceras", which along with "Wedekindella", was placed originally in the Anarcestidae.'