basis of recordMutvei, H.; Zhang, Y.; Dunca, E. (2007). Late Cambrian plectronocerid nautiloids and their role in cephalopod evolution. <em>Palaeontology.</em> 50(6): 1327-1333., available online athttps://doi.org/10.1111/j.1475-4983.2007.00708.x[details]