Helminthochiton

{{Short description|Extinct genus of molluscs}}

{{Automatic taxobox

| taxon = Helminthochiton

| fossil_range = {{geo range|Ordovician|Permian|ref=}}

| authority =

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Helminthochiton is an extinct {{taxon rank|Helminthochiton}} of polyplacophoran mollusc. Helminthochiton became extinct during the Permian period.{{Fossil chiton catalogue}}

Helminthochiton grayiae was recognised as the type species for Septemchiton. This was named for Elizabeth Gray who collected fossils at Girvan.{{cite book|title=Bulletin of the British Museum (Natural History) Vol. 17|date=2013|edition=reprint|publisher=British Museum|location=London|isbn=978-0-565-09011-1|pages=170–252|url=http://www.forgottenbooks.com/books/Bulletin_of_the_British_Museum_Natural_History_v17_1000501710|access-date=22 November 2015}}

Helminthochiton thraivensis has been reassigned to the genus Phthipodochiton in 2012.{{Cite journal | last1 = Sutton | first1 = M. D. | last2 = Sigwart | first2 = J. D. | doi = 10.1111/j.1475-4983.2011.01126.x | title = A chiton without a foot | journal = Palaeontology | volume = 55 | issue = 2 | pages = 401 | year = 2012 | bibcode = 2012Palgy..55..401S | doi-access = free }}