Robustum nodum

{{Short description|Extinct species of mollusc}}

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| fossil_range = {{fossil range|Ordovician}}

| image =

| image_caption =

| genus = Robustum

| species = nodum

| authority = Stinchcomb and Darrough, 1995

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Robustum nodum is the one species of a problematic genus of Ordovician hemithecellid mollusc proposed by Stinchcomb and Darrough in 1995.{{cite journal|jstor=1306279|pages=52–65|last1=Stinchcomb|first1=B. L.|last2=Darrough|first2=G.|title=Some Molluscan Problematica from the Upper Cambrian. Lower Ordovician of the Ozark Uplift|volume=69|issue=1|journal=Journal of Paleontology|year=1995|doi=10.1017/S0022336000026913|url=http://jpaleontol.geoscienceworld.org/cgi/content/abstract/69/1/52|url-access=subscription}}

Its similarities to Matthevia were outlined by Vendrasco & Runnegar.{{cite journal|doi=10.1666/0022-3360(2004)078<0675:LCAEOS>2.0.CO;2|year=2004|volume=78|pages=675|title=Late Cambrian and Early Ordovician Stem Group Chitons (Mollusca: Polyplacophora) from Utah and Missouri|last1=Vendrasco|first1=Michael J.|last2=Runnegar|first2=Bruce|journal=Journal of Paleontology|issue=4}}