Maiasaura spines

[DinoToyForum]

Many Maiasaura depictions in toys and palaeoart have a line of low spines running along the midline of the back and tail. e.g. the Carnegie Maiasaura



Is there some evidence for this in hadrosaurs that I'm unaware of, or is this one of those artistic flourished that have taken hold as a minor paleo-meme?

[Smilodon P.]

Many Maiasaura depictions in toys and palaeoart have a line of low spines running along the midline of the back and tail. e.g. the Carnegie Maiasaura



Is there some evidence for this in hadrosaurs that I'm unaware of, or is this one of those artistic flourished that have taken hold as a minor paleo-meme?

I know for sure that the Brachylophosaurus had this row in the back, because of the Leonardo mummy:



Apparently, the gryposaurus ROM 764 was found with similar mummified skin traces:






In a work by Jack Horner, he analyzes these characteristics on the tail of an Edmontosaurus:




Since these characteristics existing in several animals of the same family and subfamilies and in diverses age stratas, it is possible to believe that this aspect is present in all (or most of them).

Of course, that is, what I THINK. Maybe someone with more knowledge can refute these points and expose this as a simple paleomeme.

[DinoToyForum]

Thanks for the detailed response and reference images S @Smilodon P. That evidence is clear for related genera! And now I know it is called a 'segmented frill'.