Anisoceras is a heteromorph ammonite belonging to the turrilitoid family Anisoceratidae. The shell forms a loose open helical spiral in the early stages, ending in one or two straight shafts in the mature adult.
Anisoceras, an ammonite from the heteromorph category within the turrilitoid family Anisoceratidae, begins its life cycle with a shell that spirals loosely before developing into one or two straight shafts in adulthood.