Lytoceratina is a suborder of Jurassic and Cretaceous ammonites that produced loosely coiled, evolute and gyroconic shells in which the sutural element are said to have complex moss-like endings.

Sutural elements are typically complex, referred to in the literature as moss-like, with adventious and secondary subdivisions.

Aptychi are single valved and concentrically striated (Anaptychus) The Lytoceratina, which constitute a suborder within the Ammonitida, are derived from the Triassic Ussuritidae or Discophyllitidae, families belonging to the Phylloceratina, or both (which would make them polyphyletic).

They in turn gave rise to the main body of Jurassic Ammonitina and to the Cretaceous Ancyloceratina.

The Lytoceratidae also have the longest range, from the Lower Jurassic to the Cenomanian stage in the Upper Cretaceous.