Phthipodochiton is an extinct genus of molluscs, known from several fossils from the upper Ordovician fauna of the Lady Burn Starfish beds of Girvan, Scotland.

[1] It shows a mixture of aplacophoran body plan and polyplacophoran-like valves, and it is an informative fossil in the evolution of aculiferan mollusks.

[1] Phthipodochiton was carnivorous, feeding on crinoids,[3] as shown by a fossil preserved with gut contents.

[4] In contrast with modern chitons, Phthipodochiton probably did not creep on its foot but had a locomotion style similar to that of solenogastres.

[1] Phthipodochiton shares similarities with genera as Alastega, Robustum and Septemchiton.