Helminthochiton
Helminthochiton is an extinct of polyplacophoran mollusc. Helminthochiton became extinct during the Permian period.
Helminthochiton grayiae was recognised as the type species for Septemchiton. This was named for Elizabeth [Gray (fossil collector)|Elizabeth Gray] who collected fossils at Girvan.
Helminthochiton thraivensis has been reassigned to the genus Phthipodochiton in 2012.