Anisoceratidae

Anisoceratidae is an extinct family of heteromorph ammonites which belong to the Ancyloceratina superfamily Turrilitoidea.

Members of the family range is from the lower Albian to the upper Turonian.

Anisoceratid shells begin as an irregular helical spiral which typically becomes confined to a single plane with growth.

Older classifications, since first publication of Part L of the Treatise on Invertebrate Paleontology, include the Anisoceratidae in the suborder Ancyloceratina (within the Turrilitoidea).

Subsequent study, e.g. Beznosov & Mikhailova 1983, has suggested that the Turrilitoidea, including the Anisoceratidae, have a different phylogeny from the true Ancyloceratina, resulting in their occasional reassignment to a separate suborder, the Turrilitina, however this classification is not widely followed.