I think this came up as a result of hesitation when Fry et al.s pre-published their
results, and a later, yet fully published, paper presented their results in a
more phylogenetic perspective, replete with taxonomy.
Nature has not responded to my request for clarification for some time,
Well, now it is clear :-)
and I may need to mail them again for a resolution because of the _Dakosaurus_ "mosasaur-like" species issue that came up earlier.