Prehistoric chiton genera

Hanleya is a genus of polyplacophoran molluscs known from Oligocene and Miocene fossils; it is represented today by a number of species including H. sinica Xu 1990 (China), H. brachyplax (Brazil) and H. hanleyi Bean in Thorpe, 1844 (Chile), which feeds on sponges.

Lucilina is a genus of polyplacophoran molluscs. It includes species known from fossil remains, as well as living species. It is often considered a subgenus of Tonicia.

Schizochiton is a genus of polyplacophoran molluscs. Schizochiton is known from Miocene fossils, as well as extant species.