Robustum nodum

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]

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