Robustum nodum

Robustum nodum; Temporal range: Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Polyplacophora
Order:	†Paleoloricata
Family:	†Mattheviidae
Genus:	†Robustum
Species:	†R. nodum
Binomial name
	†Robustum nodum; Stinchcomb and Darrough, 1995

Robustum nodum is the one species of a problematic genus of Ordovician hemithecellid mollusc proposed by Stinchcomb and Darrough in 1995.[1] Its similarities to Matthevia were outlined by Vendrasco & Runnegar.[2]

References

Stinchcomb, B. L.; Darrough, G. (1995). "Some Molluscan Problematica from the Upper Cambrian. Lower Ordovician of the Ozark Uplift". Journal of Paleontology. 69 (1): 52–65. JSTOR 1306279.
Vendrasco, Michael J.; Runnegar, Bruce (2004). "Late Cambrian and Early Ordovician Stem Group Chitons (Mollusca: Polyplacophora) from Utah and Missouri". Journal of Paleontology. 78 (4): 675. doi:10.1666/0022-3360(2004)078<0675:LCAEOS>2.0.CO;2.

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[1] Stinchcomb, B. L.; Darrough, G. (1995). "Some Molluscan Problematica from the Upper Cambrian. Lower Ordovician of the Ozark Uplift". Journal of Paleontology. 69 (1): 52–65. JSTOR 1306279.

[ref_-2] Vendrasco, Michael J.; Runnegar, Bruce (2004). "Late Cambrian and Early Ordovician Stem Group Chitons (Mollusca: Polyplacophora) from Utah and Missouri". Journal of Paleontology. 78 (4): 675. doi:10.1666/0022-3360(2004)078<0675:LCAEOS>2.0.CO;2.